Version differences

I have video for learning the unreal engine, but it’s for 4.14 - we’re on 4.20
in terms of usage and programming, how much difference is there between the two engines? Are my videos going to be obsolete?

Any time the engine upgrades to a new version, older code breaks. The short answer to your question is that just going from 4.14 to 4.15 would cause some functionality to break. 4.14 to 4.20 you can guarantee there will be things that don’t work anymore from the demos that you are watching and you’ll have to figure out how to fix them.

Depends more on the type of the content on those videos. If they cover interface, blueprints and materials, they would be OK, but might have quite an amount of new things left to be covered. If it cover C++ with API then they are surely outdated, because this part have been receiving quite an amount of changes.