I use Filmora also. It cost $29, but it's easy and you can get to first base and make acceptable home videos. It'll even do short (5 min) videos in 4k, but of course its slow.
I think the most bang for your buck is with Premier Pro, about $20 per month with get you professional quality editing software with great color grading capabilities. If you already have a Mac, iMovie is a good option, but programs like Premier Pro allow you to use PC/Mac or whatever your budget allows.
It really depends on your computer's processing power, if you just want the basics, stick with iMovie or Windows Movie Maker, if you want something more powerful, check out a program like Premier Pro.