This is in the Zeroedit documentation.
You should read and reread the documentation that came with the modtools, especially the "Getting Started" doc.
A,W,S, and D keys: These keys can make you go straight forward, straight backward, and side to side, kind of like in the game.
8,4,2, and 6 keys on the numeric keypad: These keys make you slide forward, backward, and side to side over your map, remaining at the same height.
F and V keys: These scroll your screen up and down.
Arrow keys: These turn the camera right, left, up, and down.
"<" and ">" keys: These keys respectivly speed up and slow down the rate at which you move and rotate (very useful).