Trending Now

Python Data Structures Cheatsheet

August 25, 2026

1 min read

Model Validation Cheatsheet

August 25, 2026

1 min read

Matplotlib Cheatsheet

August 24, 2026

1 min read

GitHub Workflow Cheatsheet

August 24, 2026

1 min read

DATALAD ™

Resource Library

Every free tool, calculator, cheatsheet, roadmap, dashboard, template, workbook, project and dataset on Datalad. Everything runs in your browser or downloads directly. No sign-up.

Type

Topic

Nothing matches that filter. Clear the search or pick a different topic.

Tools

BigQuery Generator - Generate BigQuery SQL for GA4 exports, explained line by line.

GA4 BigQuery Recipe Library - Twenty ready to run BigQuery queries for the GA4 export.

SQL Query Explainer - Read any query in the order the database actually runs it.

Window Function Playground - Change the window and watch the answer move, row by row.

DataLayer Builder - Build a GTM dataLayer spec and get working code out.

GA4 dataLayer Validator - Paste a dataLayer push and see what GA4 will silently discard.

Adobe Analytics Data Layer Builder - Generate an Adobe Analytics data layer implementation step by step.

Adobe Product String Validator and Builder - Check every position of an Adobe product string, or build one.

UTM Builder with Governance Registry - Tag campaigns to one convention and keep a registry you can export.

Consent Mode v2 Simulator - What GA4 still sees, what it models, and what is simply gone.

Measurement Plan Generator - Business question to metric to event, checked against GA4 limits.

EDA Code Generator - Generate an exploratory data analysis notebook for your dataset.

Preprocessing Code Generator - Generate cleaning, encoding and scaling code for your pipeline.

Feature Engineering Code Generator - Generate feature engineering code for your modelling pipeline.

Model Selection Code Generator - Generate model selection code with cross-validation built in.

Model Evaluation Code Generator - Generate evaluation notebooks and pick thresholds by mistake cost.

Monitoring and Drift Code Generator - Generate drift checks with thresholds calibrated to your own data.

Embedding Similarity Explorer - Real cosine similarity, and the point where word matching fails.

Peeking Simulator - Run hundreds of null A/B tests and see how many you would ship.

Concurrent Test Collision Checker - Which of your running experiments actually collide, and how badly.

Maths and Statistics Practice Engine - Unlimited generated exercises across calculus, matrices, probability and statistical tests, each marked instantly with the full working.

CSS Selector and Cascade Explainer - What a selector weighs, what it matches, and the exact reason a losing rule lost.

Fluid Type Calculator - Two sizes and two viewports in, the clamp that scales smoothly between them out.

Flexbox Playground - Change a property and read why the items moved, not just watch them move.

Grid Area Builder - Paint a layout to get grid-template-areas, with a warning when an area is not a rectangle.

Breakpoint Inspector - Drag a width and see exactly which of your media queries are live at it.

Easing Curve Editor - Drag a cubic-bezier and watch a dot travel it, with the keyword presets to compare.

The em Compounding Visualiser - Four nested levels at 1.2em give you 33 pixels. Watch the browser compound them.

BEM Naming Validator - Paste class names and get a verdict on each, with the fix for the ones that fail.

SCSS extend Against mixin - The same component both ways, with the real compiled CSS side by side.

Calculators

Sample Size Calculator - How many visitors your A/B test needs before you press go.

Revenue Sample Size Calculator - How many visitors a revenue test needs, once spread is counted.

Sequential Testing Calculator - The threshold for every look, so checking early stays honest.

Bayesian vs Frequentist Comparator - The same test result read both ways, side by side.

Statistical Significance Calculator - Check whether your test result is real or just noise.

Power and MDE Calculator - Trade off power, sample size and minimum detectable effect.

Test Bandwidth Calculator - How many experiments your traffic can actually support.

Cart Abandonment Improvement Calculator - Size the revenue hiding in each step of your checkout.

Cheatsheets

Python Cheatsheet - Core Python syntax and patterns on one page.

BigQuery SQL Cheatsheet - The BigQuery SQL you use every week, on one page.

Deep Learning Cheatsheet - Architectures, layers and training concepts at a glance.

Working with Data Cheatsheet - Loading, cleaning and reshaping data, condensed.

CSS Cheatsheet - Selectors, layout and core properties on one page.

BEM Methodology Cheatsheet - Block, element, modifier naming that stays maintainable.

Testing and Debugging CSS Cheatsheet - Find and fix broken styles methodically.

SCSS Variables Cheatsheet - Store values once, reuse them everywhere.

SCSS Mixins Cheatsheet - Reusable CSS blocks without the copy-paste.

SCSS Inheritance Cheatsheet - Share styles between selectors with extend.

SCSS Partials Cheatsheet - Split stylesheets into organised, importable files.

Roadmaps

Data Analyst Roadmap - The step-by-step path from zero to working analyst.

Data Scientist Roadmap - Every subject on the road to data scientist, in order.

Machine Learning Scientist / Engineer Roadmap - From foundations to production ML, mapped out.

LLM Engineer Roadmap - Five chapters from attention maths to shipping LLM systems.

Implementation Engineer Roadmap - GTM, GA4, data layers and QA as a career path.

Martech Engineer Roadmap - The stack between marketing and engineering, in order.

Front End Developer Roadmap - HTML, CSS and JavaScript to job-ready, step by step.

Dashboards

Digital Marketing Monthly Dashboard - Consolidated monthly KPIs across nine marketing channels.

Digital Analytics Monthly Dashboard - A ready-made monthly reporting layout for site analytics.

Mobile App Monthly Reporting Dashboard - Monthly app KPIs in one reporting template.

Ecommerce Dashboard - Sales, orders and profit on one Excel sheet, tracked month on month.

B2B Lead Generation Dashboard - Leads, quotes and sales in one view, so marketing and sales read the same numbers.

Templates

GA4 Audit - Audit your GA4 setup against a structured checklist. Free download.

Digital Tracking Documentation Template - A single source of truth for your GA4 and GTM setup. Word and PDF.

A/B Test Checklist - Everything to verify before an experiment goes live.

Post A/B Test Analysis Template - Structure the read-out so decisions survive the meeting.

A/B Test QA Process - The QA process that catches broken tests before they cost you.

Hypothesis Template - Write the hypothesis before you run the test.

Ecommerce CRO Checklist - Conversion checks for every ecommerce page type.

Landing Page Checklist - What a landing page needs before you send traffic to it.

Structure of a High-Converting Landing Page - The section-by-section anatomy of a page that converts.

Portfolio Project Briefs - Ten realistic data projects, each with its trap named.

Workbooks

Self-Attention Workbook - 10 exercises on the maths behind transformers.

Sampling Distributions Workbook - Exercises with worked solutions.

Sampling Design Workbook - 10 exercises with full solutions.

Discrete Probability Distributions Workbook - 10 exercises with full solutions.

Correlation and Regression Workbook - 10 exercises with full solutions.

Correlation and Linear Regression - Worked introduction with exercises.

Simple Regression Model Workbook - 10 econometrics exercises with full solutions.

Units of Measurement and Functional Form Workbook - 10 econometrics exercises with full solutions.

Matrices and Linear Equations Workbook - Exercises with worked solutions.

Integration Workbook - 10 exercises with full solutions.

Differential Equations Workbook - Exercises with worked solutions.

Projects

Member Churn: A Complete Project - A churn model end to end, from problem definition to evaluation, with the data to work along.

Post-Test Analysis - A finished A/B test taken to a ship or no-ship call, and the four faults that made the win imaginary.

The Profit Leak Audit - Revenue up, profit flat. Contribution margin per order finds the leak below the line every report stops at.

The Funnel That Leaks - Checkout conversion fell. Telling a real site failure from a tracking artefact, when both are happening at once.

Channel Reallocation - Three faults in a channel report, and a ranking that reverses on every device once device mix is accounted for.

Cohorts, Retention and LTV - Customer value looks like it is collapsing. It is not, and the fix produces a defensible acquisition ceiling.

Segmentation That Survives Scrutiny - Clean segments that hold up under resampling, and six months later only 37 percent of customers are still in them.

Late Payment Prediction - Two people, 120 calls a week. The model with the best precision points them at the smallest invoices.

Lead Scoring and Threshold Economics - A score worth 1.82 times conversion, sitting next to a six hour response time worth 5.36 times it.

Price Elasticity From Observational Data - Two years of prices and a clean log-log fit that lands 45 percent short, because price was never set at random.

Anomaly Detection When Positives Are Rare - Fraud under half a per cent, so doing nothing scores 99.56 percent. Building a queue two analysts can actually work.

Demand Forecasting With Backtesting - A rolling origin backtest, and the accuracy metric that quietly ignores every week demand was zero.

Recommendations From Order History - Six recommenders on one holdout, ranked almost backwards by the metric everybody reports.

Uplift Modelling From an A/B Test - Conversion rose 2.98 points and the campaign lost money. Separating the persuadables from the sure things.

Deep Learning Against Gradient Boosting - Three architectures, ten splits, equal budgets. The simplest wins, significantly, by less than a quarter of the noise between splits.

Support Ticket Triage - A word counter looks finished at 89.7 percent until the wording changes. The ceiling is 93.1, and knowing it changes the decision.

Review Themes at Scale - Topic modelling recovered four of the ten real themes and missed the complaint that tripled. An afternoon of labelling beat it.

Product Catalogue Auto-Tagging - Six attributes, one model, and a 65 point spread hidden inside a single average. One of the six should not ship at all.

KPI Anomaly Alerting - Four detectors held to one false alarm budget all caught the same eight. Removing the day of week was worth four times the LSTM.

Invoice and Receipt Extraction - Rules reading three quarters of the fields scored zero on a new supplier. Five label strings fixed it, and arithmetic caught the rest.

Structured Extraction From Messy Documents - Rules scored zero on a supplier nobody had configured. A local model scores 98.4 with no setup, and invents three figures that agree with each other.

RAG You Can Actually Evaluate - 146 questions over an agency's own notes. Invented answers peaked at 2.1 per cent, and the superseded rate card was quoted 33.3 per cent of the time.

LLM as a Judge - Two local judges agreed with the known grades 10 and 17 per cent of the time, and with each other 54. Five lines of Python agreed 91.

An Agent With Tools - The best agent picked the right tool on every answerable question and still filled in 9 of 52 argument sets wrongly. Tool accuracy hides it.

Datasets

Brightcart Club Churn Dataset - A deliberately messy churn file for practising real data cleaning.

Messy Ecommerce Orders Dataset - Nine deliberate faults in an order export, and not one of them raises an error.

Messy A/B Test Results Dataset - A finished experiment you cannot read, starting with a sample ratio mismatch.

Messy Churn Training Dataset - Four leaky columns that take a churn model from an honest 0.67 to a useless 0.99.

Messy Channel Performance Dataset - Simpson's paradox, self referrals and two currencies in ninety days of channel data.

Messy Satisfaction Survey Dataset - A satisfaction trend that rises because the unhappy customers left the sample.

Messy GA4 Events Export - Duplicate purchases, values sent as text, and a revenue total that looks right.

Python Data Structures Cheatsheet

Model Validation Cheatsheet

Matplotlib Cheatsheet

GitHub Workflow Cheatsheet

Resource Library

Subscribe to My Newsletter