This blog series (1, 2, 3, 4, 5, 6, 7) has given an introduction to Wormhole and a tour of some of its low-level functionality. If it has whetted your appetite, then the follow-up is the tt-isa-documentation repository I've been writing - it is the comprehensive reference manual going into detail on all the pieces. The reference manual bookends the blog series; there's no need for more blog parts, as the manual contains all the material I'd want to cover.