Recently I've been dabbling with an android (possibly IOS too?) video editing app called Videoleap and it's probably the best I've used. You can trim clips really nicely, add any music and sync it up quite nicely, you can adjust the colour and overall look of the image well too, AND, you can export at 4K 60p and many more options. It's free, not sure about many of the other things it can do like text and other shit but it can do it. Way better than Adobe Rush or Push or whatever the fuck it was called. So far so good imo.