Support for 4K video source content has become pretty standard in video editing software, but the support varies among the products. For example, some but not all of the applications can import Sony XAVC and XAVC-S formats, which are used by Sony's popular DSLRs, mirrorless cameras, camcorders, and professional video cameras. The same holds true for the H.265 High Efficiency Video Coding (HEVC) standard. Most of the applications here now can import and export HEVC, though there are still a few holdouts.
In the midrange, there's Adobe Premiere Elements, which is cross-platform between Macs and PCs, and offers a lot more features and lots of help with creating effects. Professionals and prosumers have powerful, though pricey options in Final Cut Pro X and Adobe Premiere Pro. Final Cut is a deceptively simple application that resembles iMovie in its interface and ease of use, but it offers massively deep capabilities, and many third-party apps integrate with it for even more power. It also makes excellent use of the Touch Bar on the latest MacBook Pro, as shown in photo above. Premiere Pro uses a more traditional timeline and adds a large ecosystem of companion apps and plug-ins. It also excels in collaboration features.
KineMaster is one of the most powerful video editor apps available. You can do the basics like most of these other video editors can. However, this one includes multiple video, image and effect layers. Additionally, there are audio filters, chroma key (for your green screen fans out there), various video effects, transitions, and more. It's not as powerful as a full desktop editor. However, this gets much closer than most other competitors. We would recommend this for actual video production (at least for stuff like YouTube). You can use it for free in trial mode for a while. However, you'll need the $4.99 per month subscription to get everything forever.