these vary by mode, which you can change by clicking on the little panel at the bottom of your screen. Click on the cog, and then:
Orbit
Move camera: 1 finger drag or Left Mouse Button
Pan: 2-finger drag or Right Mouse Button or SHIFT+ Left Mouse Button
Zoom on object: Double-tap or Double-click on object
Zoom out: Double-tap or Double-click on background
Zoom: Pinch in/out or Mousewheel or CTRL + Left Mouse Button
First Person
Move: ↑,←,↓,→ (or W,A,S,D)
Look around: 1-finger drag or Left Mouse Button
Adjust speed: Mousewheel