Tools
Free tools that each do one job properly. Interactive builders that generate the code for you, covering GTM and Adobe data layers and data science preprocessing, plus cheatsheets for Python, BigQuery SQL, CSS and working with data. All of it runs in your browser, with nothing to install and no sign-up.
SCSS extend against mixin
One groups your selectors, the other repeats every declaration. See both compiled side by side, with the media query limit and the cascade surprise that extend brings.
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