Design Space lists Cricut fonts and your installed system fonts in one dropdown, and that split explains almost every font question. Writing style, realistic minimum cut sizes, and missing font fixes.

Inkscape is free and covers everything a cutting machine needs. The six Path operations worth learning, how Trace Bitmap behaves, which export format each machine wants, and how to inspect a bought SVG.

Transfer tape fails for exactly two reasons: too much grip or too little. A step by step application method, the grip level to match each vinyl type, the hinge method for accurate placement, and how to diagnose a transfer that went wrong.