Use Creative mode: open the world settings or use the game mode command to switch to Creative
Press and hold the jump key to rise
Press and hold the sneak key to descend
Use the movement keys to steer while flying
Use Elytra: equip Elytra in your chest slot
Jump from a high place to start gliding with Elytra
Use fireworks while gliding to gain speed and stay airborne longer
Use commands if cheats are enabled: `/gamemode creative`
Use commands if cheats are enabled: `/gamemode spectator`