Today I watched John Muir Law’s workshop about gesture sketching, that focused on the preparation phase of a drawing: getting proportions right, identifying useful reference lines, blocking shapes, all before diving into details. It put together a lot of tips and gave many occasions to test these by copying from pictures. It is quite useful to learn to put the sketch together rather quickly, for the cases when the subject is an animal that moves fast.
Here is the sheet of paper that I filled while watching the video (notes both in English and Italian, as the video was in English but I write faster in Italian!):