1. `/health <set/add/remove> <health> [player] [set max]` - Set/Add/Remove player's health. If player is not specified, it defaults to oneself. If 'set max' is set to true, it will also set the player's maximum health. If not specified, the maximum health is not modified, only the current health is adjusted.
2. `/setfalldistance <distance> [player]` - Set player's fall distance. If player is not specified, it defaults to oneself.
3. `/burn <time> [player]` - Set player's burning time. Time is measured in ticks [20 ticks = 1 second]. If player is not specified, it defaults to oneself.
4. `/freeze <time> [player]` - Set player's freeze time. Time is measured in ticks. If player is not specified, it defaults to oneself.
5. `/toggleglow [player]` - Toggle player's glowing effect. If player is not specified, it defaults to oneself.
6. `/togglegravity [player]` - Toggle player's gravity. If player is not specified, it defaults to oneself.
7. `/toggleinvulnerable [player]` - Toggle player's invulnerability. If player is not specified, it defaults to oneself.
8. `/togglefakefire [player]` - Toggle player's fake fire effect. It makes them look like on fire, but it's only a visual effect.If player is not specified, it defaults to oneself.
9. `/forcebreak [player]` - Make the player attempt to break the currently targeted block with the item in hand. If player is not specified, it defaults to oneself. This command instantly destroys the block in front of the player using the item in hand. Drops are based on the item being used. For example, breaking diamond ore with bare hands will not drop any items, while breaking it with a Fortune III Netherite pickaxe may drop multiple diamonds. This command can be used to break bedrock, barriers, etc., but not command blocks. Use with caution.
10. `/chat <player> <message>` - Send a message in the chat as a specific player. The player name must be provided.
11. `/cansee <player1> <player2>` - Toggle whether player1 can see player2.
12. `/setndt <time> [player]` - Set player's no damage ticks. If player is not specified, it defaults to oneself.
13. `/setarrowsinbody <amount> [player]` - Set the number of arrows in player's body. If player is not specified, it defaults to oneself.

Permission: modifyplayer.[commandname]
for example modifyplayer.health

If you didn't enable the fly in the server, players will be kicked for the reason "Fly in the server is not enabled" when they are gravity-less