In this answer of another post, you can find the most important resources ppxlib has. We’re working both on integrating some of those resources into the ppxlib manual and on adding more info to the manual. We’ll also add some brief info on special use cases which in particular will contain some information about Of_ocaml and To_ocaml. It’s a good point that we also need to add some explanations about how ppxlib works to make sure people know that ppxlib takes care of ppx rewriters being cross-compiler compatible! Thanks for bringing that up 
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