Everything that has to be decided, designed, built, measured and tested before a landing page can be expected to convert: 124 checks across thirteen stages, from the first strategic decision to the tests you run after launch.
A landing page fails in more places than it looks. The message does not match the ad that brought the visitor. The hero explains the product before naming the problem. The form asks for a phone number nobody was going to give. The hero image is lazy-loaded, so the largest element on the page arrives last. The conversion event was never tested, so the whole thing runs for a month before anyone notices the numbers are wrong.
This checklist covers all of it in the order the work actually happens: strategy, structure, copy, design, mobile, forms, trust, build and performance, accessibility, SEO and AI search, tracking, pre-launch QA, and what to do once it is live. Each item carries a one-line reason underneath, so it explains as well as reminds, and 34 items are marked as highest leverage for when there is not time for all 124.
Nothing in it assumes a particular stack. It works the same for a page you are designing from scratch and one you have inherited and are trying to fix.
Hope this is helpful, Andrei.
