If you are playing or on your own server , you can use any hack you want. If you join a server that prohibits hacks, using them makes you a cheater. Always read the server rules.
Most servers run plugins like:
Minecraft is a popular sandbox video game created by Markus "Notch" Persson and later developed by Mojang Studios. The game allows players to build and explore a procedurally generated world made of blocks. Over the years, Minecraft has become a cultural phenomenon with a vast community of players and developers. descargar hacks minecraft 1.12.2