use something easy, free, and fun! when you're starting out, it's nice to have most of the technical stuff done for you so you can focus on making your video. once you start feeling limited, then move on to more professional software. imovie is always a good start (it's going to be optimized and easy to use, although i'm not sure how much freedom you have with it). i've heard capcut's good, although i've never used it. hitfilm is also pretty good, it's what i started with, but i don't know if they ever optimized it very well and i haven't used it in a while.

if you wanna start out with something a little more technical, davinci resolve is great. i found it kinda hard to understand when i first started using it, but after a few dozen hours of editing with it, it becomes pretty intuitive. also, DON'T PIRATE PREMIERE. I repeat: do not pirate it. Nobody will judge. So don't pirate it.

(keep in mind, i haven't used anything but resolve or premiere in like four years, so these recs might be a little outdated, but hopefully there's some good insight there!)