The Super Basic Handlettering Guide
When I say super basic, I mean super basic as in no fluff. This guide, albeit basic, is comprehensive. It gives you a brief overview of letter forms and their composition. It also goes over structure and muscle memory for the lower and uppercase alphabets!
Even better, it comes paired with the Nib + Ink Brush from Virginia Handwriting Co. to accompany you, should you use it on your iPad!