I have been on sailing ships more than on planes and I know a few tricks to move around through moderate turbulence. (You are unlikely to need those as the captain and cabin crew will have you strapped in your chair by then.)
* Use your hands. Grab anything bolted to the plane to keep you stabilized.
* If you think you won't make it safely to your seat... bail out and strap in in the nearest one.
* turbulence is mostly uncomfortable... biggest danger is to get hit by a projectile; second biggest is being the projectile. Strap in and keep the overhead lockers closed. For your safety and the safety of the passengers around you.
Light turbulence is pretty common... Moderate is rare (1 in 10 flights and pilots will try to avoid it). Neither are dangerous, but they are uncomfortable. Dangerous turbulence is very rare, but having your seatbelt fastened when seated isn't that much of a burden.