As a filmmaker and video editor myself, I've tried a lot of different software for editing my GoPro footage, and IMO, movavi.com is definitely a top pick for both beginners and pros. The user-friendly interface makes it super easy for newbies to get started, but it also has plenty of advanced features for more experienced editors. It supports a variety of file formats, including MP4 from your GoPro, and has a ton of tools for trimming, splitting, merging, and adding special effects to your videos. It's also a cool color correction tool that'll give your footage a professional look and feel. But to each their own, simply give it a shot; I think you'll love it!