The plugs should be re-gapped every 50 flights or you start to lose power, and the valves should be adjusted on a similar schedule or they get noisy.
Also top off all the fluids before every flight.
Discuss RTH with him and see if he understands it well. If you don't understand that in the worst possible case – The RC has some failure and permanently disconnects, the drone will come back and you will not lose it. With VERY high reliability...
Pretty clear you don't see it.
A few minutes on YT will cure that.
I own a dozen or so of the cheapies. In anything other than dead still air, they are quite a challenge to fly. Especially the ones lacking all positioning sensing AND altitude hold.