Keyboard Keys W,A,S,D moves your AVATAR & moving your MOUSE allows to look in any direction: (Instructions Below).

Using Mouse to for Directional Viewing: 

Sliding MOUSE Forward will look up (ceiling).

Sliding MOUSE Backward will look down (floor)

Sliding MOUSE Left will look to your Left Side.

Sliding MOUSE Right will look to your Right Side.

W:          Moves Avatar Forward

S:            Moves Avatar Backward

A:            Moves Avatar to the Left

D:            Moves Avatar to the Right

Please note that you would use both mouse and keyboard keys (above) to move your AVATAR in VRChat

Special Keys:

V:            Pressing and HOLD V Button to TALK. Releasing V Button will MUTE

C:            Press once to SIT and Press again to STAND

Z:            Press once to CRAWL and Press again to STAND

R:            Brings up GESTURES menu: (Pressing ESC to exit the menu from view).