Below is a useful Youtube video for new users of EdgeTX, all good advice on how to configure your Tx to get the best out of it. All done on a RadioMaster TX16 (which a lot of EdgeTX users have), but will equally work on any EdgeTX radio, the screen might just look a little different.
One of the commandments is how to update your firmware – very useful but do remember if everything is working, there isn’t really any need to update it; don’t be the person who updates it every few months just because a new version is out.
The manual for EdgeTX is also very useful and can be found here for colour radios and here for monochrome ones.