How to learn all about video editing?
The best resources I've seen for learning how to edit are on YouTube. A lot depends on what NLE you'll be using to edit, but most editing fundamentals translate well across all NLEs (which is what I believe you're asking for anyway). 

One popular YouTube channel with a ton of videos on how to edit is Film Riot. They have 700+ videos on all aspects of production, but a search for "edit" on their channel shows they have a ton to offer on that subject as well. They typically stay in Adobe Premiere Pro, but they generally strive to make their tutorials work across any editing software.

Surfaced Studio is another channel I've discovered recently with a nice playlist of some beginner-level Premiere Pro tutorials. Unlike Film Riot, Surfaced Studio seems to be pretty specific to Premiere Pro - usually, explaining how to work within the PP interface.