Placing/breaking blocks is somewhat glitchy. You may slowly get out of sync of other players. Leaving the game doesn’t work. Mobs do not sync. Time does not sync. Chat doesn’t work yet. Nether/other chunks break. (And many more things) Tap to place blocks. Hold to break blocks. Click the 3 dots to open the inventory. To use most blocks click on them then click the 3 dots. To save or chat click save and commands. To eat click the screen when holding the food. To get out of the any inventory click the 3 dots again.