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Geometry Nodes
Setup
Enable Node Wrangler add-on.
Set Spacebar to search.
Set the maximum Undo steps to 256.
It can be useful to have a large graph section in the middle and the Viewport and Spreadsheet in a column on the left.
Fundamentals
Selecting an object and clicking on New in the Geometry Node Editor will add a Geometry node modifier to that object.
The Spreadsheet panel displays information on the way the geometry is being evaluated with information on (for example) the position of Vertices, Edges, Faces and Face Corners. These Face corners are for each vertex the way it unwraps on the UV (on a cube, each vertex will have 3 face corners attached).
Keyboard Shortcuts
SHIFT+ALT+LEFT CLICK: Automatically connect target node to Group Output.
BACKSPACE: Reset target node to default values.