GIMP - Free alternative to photoshop, and extremely similar in the way that it operates. Also, an abundance of short and succinct 'How do I...???' type tutorials on YouTube make any teething issues a breeze...
Available on PC, Mac or Linux -
https://www.gimp.org/
Like photoshop, it is extremely powerful, but you dont need to learn ALL of the poogram, to learn how to do the basics that YOU will need for YOUR workflow - & should an need arise where you DO need to use a different function, there is always a youtube tutorial close at hand
Random 'Getting Started / Overview Video'
Random tutorial example.
Editing My Videos?
DaVinci Resolve - Professional quality, and again, 100% free - Same youtube help available
https://www.blackmagicdesign.com/pro...davinciresolve
Again, its as equally good and a home with editing a home video for Youtube, as it is when its used on professional hollywood blockbusters
Full Playlist of 2 minute 'How Do I...???' videos for DaVinci Resolve
HERE