Key bindings are very important. They open menus or GUIs, place blocks and move you.
How to Move
You can use the WASD keys or the arrow keys to move. In creative mode, you can double click 'W' or '↑' to fly.
The defaults are:
E= Open the inventory.
Shift-left-click= Place a block.
T= Open tasks.
Q=Drop item selected.
You can always change these key bindings by go to the 'Home Screen', then 'Settings/Skins', then 'Key Bindings'