To interact with things in-game, get close to them and Left Click.
To zoom the camera in and out, use the Mouse Wheel Scroll.
To move your character, use the WASD keys.
To use the dodge/roll action button, use the Spacebar.
To rotate the camera, use the Q and E keys.
To open the character inventory and gear page press C.
To view your in-game wallet, press C.
To lock the camera and strafe, use the Right Click.
To open the emote menu, press and hold T.
To play in full-screen mode, click the blue arrows on the bottom right of the screen.