I would like to see a way to figure out the mod without old videos, that aren't from 1.14. And that don't need testing.

https://wiki.computercraft.cc/CC:Tweaked
Third on Google

Most of the stuff should be the same as the original wiki with some additions which can be found on the GitHub wiki.

The most accurate information is probably in the help program.

As Lupus says, both the CC and CC:T wiki should be pretty accurate here - there's been a couple of minor changes, but most things should work the same.

I'll try to add some comments on the wiki to show when things are substantially different between versions.

There is now a page summarising the major differences.