The main way you'll be moving objects around the scene is through Free Mode.
To get into Free mode:
Select the Mode tab on The Ribbon.
Click Free Mode.
Now you can move objects along an axis by clicking and dragging on one of the arrows. You can select between either moving or rotating objects from The Ribbon buttons, or alternatively, you can press T for the position Gizmo and R for the rotation Gizmo.
For more information see the Free Mode Documentation.
Next up: Applying Effects.