Insurance and security
Insurance
Understand the difference between third-party liability cover (injury to others and damage to their property) and hull cover (your own aircraft). The operator - the person or organisation responsible for the flight - carries the liability, so check that the policy is in the operator's name and matches the actual operation. Commercial use, night flying, flight over people or beyond the stated limits may be excluded or require an endorsement; flying outside the policy conditions can void cover entirely, which is far worse than having no claim paid. Some operations carry a legal insurance requirement and others only a prudent one, so verify the current position for your operation rather than relying on a general statement.
Security
Security has two halves. Physical: keep the aircraft and controller locked away, never leave kit visible in a vehicle, and protect batteries. Cyber: apply firmware updates, change default passwords on apps and accounts, enable two-factor authentication, be wary of third-party apps and unknown USB devices, and remember that control and video links can be intercepted. GNSS jamming and spoofing, and 'drone-jacking', are real risks. Flight logs and footage are personal data - secure them accordingly. Finally, treat sensitive sites (prisons, nuclear, military, government) as no-go even where no circle appears on a map, and report suspicious interest in your operations.
Trap: assuming your cover follows you everywhere and covers every use. Cover is tied to the operator, the aircraft and the declared use.
Rule of thumb: read the exclusions before you fly, and if a flight would need you to check the policy wording, that is the moment to check it.