What are the best resources for learning website performance optimization techniques + best practices?<p>eg: https://developers.google.com/web/fundamentals/performance/why-performance-matters/
It’s tricky because there’s backend performance tuning and front end tuning, backend is of course super dependant on your stack whereas the front end is based on standards at least. Is your website static (I.e not an app, not authenticated and not refreshing very often)? Then a (not proud) shortcut to start with is to put a CDN in front of it and then just optimise your front end (css, JS, HTML) and you can google for that (a good start is to try using the Google Pagespeed insights tool - it’ll scan your page and tell you what it thinks you need to optimise).
web.dev appears to repackage google's website optimization content in a more "narrative" format: <a href="https://web.dev/learn" rel="nofollow">https://web.dev/learn</a>