VFX in Resolve
Below, you will find a broad range of videos that teach you how to do some popular video effects in DaVinci Resolve.  There are also some videos that teach you some VFX using other softwares.  Don't worry too much, you will be able to apply the principles and still achieve the effects in DaVinci Resolve. These range from green screen effects, to Zach King kind of stuff, to peeling off your face like Tom Cruze does in the Mission Impossible films, to creation of fire and fog. It's in no particular order, but I'm pretty sure you'll find a whole bunch of great material you can learn from and incorporate into your short films.
If you get stuck, you might find it useful to try a few of the intro tutorials - intro to colour grading, compositing, editing in Resolve etc.