It really depends on what platform you use ... Mac or PC ... and even Android.
Second it depends what you really want to do ... fancy commercially viable or just to chuck up on Youtube / Show the friends ?
I have two main editors I use on a PC ....
Windows Live Movie Maker 2012 - the simplest editor you could ever use ...
Movie Maker v26 - a full frame based time line editor that does just about all .....
Both are FREE .... yes FREE. You just have to find them online as Microsoft - bless their little cotton socks - decided us mere mortals didn't need such any more and integrated one of the worst PoS into the Picture Viewer app on Win 10.
Simple Google brings up download sites. Do not download the latest versions - keep to the ones I mentioned above.