Below are links to scripting guides and documentation for various products, all of which are kept up-to-date with the latest releases of the host application, and are easily bookmarkable/searchable/savable.
All are open-source, public contribution-friendly, and are the result of many hours and days of work by members of the community!
Main Landing Page
https://docsforadobe.dev/
After Effects Scripting Guide
https://ae-scripting.docsforadobe.dev/
After Effects Expressions Documentation
https://ae-expressions.docsforadobe.dev/
Javascript Tools Guide
https://extendscript.docsforadobe.dev/
aequery Documentation
http://aequery.aenhancers.com