Just checked and noticed you have an Air 2. For the best results that I found to start you off with is:
1, make sure that your gimbal settings are set correctly for smooth footage check out @ianinlondon video on these settings:
2, utilise spotlight mode basically just draw a box around the subject you wish to record and let the drone do the gimbal work you can then concentrate on flying the drone but spotlight mode will keep your subject perfectly framed and will eliminate any jerky gimbal movements.
You can produce some amazing smooth video using the above settings. Check out my personal example I filmed on a days fishing back in September.
Was filmed using my Mavic Air 2 (using spotlight mode) and Osmo action. Edited in iMovie.