Hi there & welcome to the forum ?
... the Mavic Air is a very capable drone, take the opportunity to grab some extra batteries, they seems to be hard to find nowadays.
Here below some good to knows ...
Read the user manual ...the thick downloadable one, not only the quick start, download here -->
https://dl.djicdn.com/downloads/Mavic Air/Mavic_Air_User_Manual_v1.2_en.pdf
Power on in the right order ... First power on your RC & start the app ... after that, power on the drone (& do it on the spot you're going to take off from). Reverse order to shut down.
Before take-off ALWAYS ... add in one very easy check to avoid a really scary event coming from accidentally launching from a magnetic disturbed place with following flyaway at height in an uncontrollable "toilet bowl" shaped flight path. After powering on your drone, connected to your RC/app & placed it in the take-off spot ... but before lift-off,
ALWAYS check that the drone icon on the map in your app is pointing equal in relation to other objects in the map as the drone does in reality ... if not, abort launch attempt, power down & move away, power up again and repeat.
Keep well under the wind spec where you fly ... and please note that it's not only at ground, it's at
the altitude where you fly. The winds up to 400ft are very different then on ground. Use for instance the UAV Forecast app where you can get a feeling about the winds on higher altitudes, but please note that it's forecasts we are speaking of, a bit of common sense is good to apply to that ...
"better skip flying a windy day & fly more another day".
Don't go & calibrate everything on a regularly basis ... why fix things that are working, it's just a higher risk that you by mistake calibrate your compass in a magnetic disturbed area & the drone goes haywire 10 meters up in the air. Calibrate IMU + compass according to user manual, keep away from magnetic things like cars, metal tables & reinforced concrete at take-off & compass calibrations. If the app recommend a compass calibration first try another launch spot on a far distance from the first ... if calibration still is recommended by the app do it, but only then.
Don't launch in a hurry ... wait until you have at least 8, preferable 10 locked satellites & wait for the lady voice announce that the Home point has been updated, check then on the map that it's in the correct spot. Learn how the RTH function works, don't set the altitude for that unnecessary high, look around were you are going to fly and set it to clear the highest obstacle, to high & the drone risks a blow away.
Seek up a large open place ... a soccer field, free of obstacles & people. Test off every function one at a time until you fully understand how it works & the logic behind, confirm through the user manual if needed. Fly low, slow & near.
Take the claimed control distance from DJI with a pinch of salt ... only doable out in the countryside completely free of WiFi disturbance & obstacles in between the Remote & Aircraft.
Don't rely 100% on the obstacle avoidance sensors ... they are good & handy to have to perhaps save you when making a mistake, but they can't see everything, especially thin branches & wires so don't think they will allow your drone to just bounce away from everything all the time.
The Pause button on the RC ... It's a handy one, it will stop all automated modes immediately (if you have GPS coverage). Place your thumb on that when you initiate a automated flight mode & be prepare to stop it if too close to a tree for instance.
Don't use the RTH button as a "panic button" it's usually the weakest mode of them all ... you will always have access to more power in the manual modes ... if slow against a bit to strong head wind, go for Sport mode, drop altitude & maneuver the drone home manually.
Learn the rules & regulation ... keep the drone within Visual line of sight, if you can't avoid going out of visual keep it at least in line of sight (unobstructed line between Remote & Aircraft even though you don't see it) so you don’t lose the connection.
