Basic keys
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G (grab) to move things (it gets attached to the cursor: use Esc or RMB to cancel).
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F3: "action palette".
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N: show new options, that I don’t know how to explain. Some extra tabs into the view (Item, Tool, View).
Camera basics
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Press the camera icon (Numpad 0) to view through the camera.
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Press G to move the camera (e.g. scroll wheel to zoom).
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Make the camera move with the orbiting: press N to open some options on the side into the preview. Now: View → Lock Camera to View.
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Align Camera to View: Ctrl+Alt+Numpad 0
Misc
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Make the rendered image transparent by changing: Render Properties → Film → Transparent. The render properties are on the right panel, one of the first icons, shaped like a digital camera.
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Change the rendered resolution in: Output Properties (printer-like icon on the right panel).