BEFORE YOU FLY YOUR DRONE FOR THE FIRST TIME READ THIS LEAFLET.
Flying with Control - CAA brochure
When you first get your drone and sometimes if you crash your drone it may drift in one direction instead of lifting off vertically. It is times like this when you need to 'trim' your drone. This video will show you how to do this. We used one of our FQ777-124 Pocket Quadcopter for this.
Bit of advertising at the beginning but the rest is useful for beginners