In our experience many problems we encounter with customers stem from incorrect configuration/setup of Betalight.  While Betaflight is an impressive flight control firmware, there are hundreds of parameters that you can tweak and play around with so it's not surprising it can be very daunting to setup and configure.  

Below is a list of helpful videos we have collected that will help walk you through the process.  if you have found anything helpful, please reach out to us so we can add it to this list.

This video will go over the entire process in details about how to fully flash and setup your drone from scratch.

If you are looking for a more beginner orientated video this is the one to start with.