I recently received a bunch of specialty vbits ordered from my local (French) supplier, I noticed they came with a printed page of tips and tricks, and it happened to include a link to a Youtube toturial video of a Belgian guy explaining the concept of inlays and how to do them in Vectric VCarve.
Out of curiosity I watched it and it has to be one of the most accessible/educational vcarve videos I have seen so far. Then I noticed that he also made an English version, so I thought I would share since this is a topic than keeps coming up on the forum.
(original French version here)
Of course there are also a bunch of excellent threads here explaining the same concepts, but some folks prefer videos.