Both Pathfinder 2e and the Lancer TTRPG rulebooks are basically software implementation guides.

Lots of use of tags and other capitalized technical terms. Information presented roughly in the order you would program them.

Excellent on the technical end but also understandable.

And a good rulebook has pictures/ examples too.

Lancer does a great job of also presenting mechanics in the order you’ll encounter them. High-level abilities aren’t available till late game and the new mechanics they introduce only become relevant late game. So they’re later in the book.