Use isometric grid paper to sketch a hall tree (coat rack).
Joint Push/Pull, Weld, Curve Maker and Draw Pipes from Lines. All very useful! And all available free from the SketchUp Extension Warehouse.
Use the Subtract tool from the Solid Toolbar and the Intersect with Model tool to cut a hole through a curved wall. Also covered is Paste-in-Place.
Convert a doodle sketch from JPG to SVG, import and model, and then 3D print
How to make a layout document (scaled, orthographic drawings) from a SketchUp model
How the sweep and revolve tools work.
How to link a local folder to SketchUp so it’s always available, and fill it with components and materials of your choosing.
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How to draft circles with a template and compass. Diameter and radius.
Enable the 3D sketching option to do things you can’t do with a 2D sketch, such as sweep and snap to points.