I believe the mobile version of adobe premiere rush is free on the app store. Used it for this when I was too lazy to bring out my cameras and too lazy to convert apples stupid .mov files to mp4.
Definitely not my best work, but it was all made on an iPhone during a 24-hour car ride back from Targhee. As far as actual tips go, do something interesting and try to match it up to the music. I am by no means an eheath but you can make something interesting with pretty limited effects and knowledge.
For this one, the vid within vid, some color grading to make the crappy camera quality look intentional and trying to match with the song went a long way.
And finally, with this example, break up your video! We didn't have many clips for this one but even having somewhat of an Intro (broll):Clips:Crashes:Interlude(broll):Clips:Closing can go a long way for making a shitty incomplete edit like the above one look sorta finished and complete.