Please consider supporting me via Patreon at:
The standard safety check for a quadcopter maiden is to stand far away then raise the throttle slowly. If anything is wrong, the copter will flip violently when you try to take off. But this is still pretty dangerous, and some people have been injured or their property damaged when the quad flew in an unexpected direction or they stood too close.
I'll show you a better safety check for confirming that it's okay to take off, without your quadcopter FLIPPING OUT.
---
If your quadcopter is trying to flip out, here is a video to help you figure out what the cause might be.