I’ve seen a bit of it around but know nothing about it. I do love large world building with extensive story lines (I really enjoyed the entire Dune series, even the prequels his son wrote). So if I wanted to start reading WH books, where should I start?
I started with All Guardsmen Party, only understanding about half of what was going on through context clues and some familiar names.
Now, for what I think might actually be a decent introduction to the lore: Eisenhorn trilogy, Ciaphas Cain, Helsreach, the Night Lords omnibus… And honestly, if you have any faction you’re particularly interested in, just pick a book that focuses on them. If you like a certain Space Marine chapter, pick one of their books. They have internal series but each group of books is greatly independent from all others. I started with the Carcharodons books and really enjoyed them. I absolutely loved reading Assassinorum:Kingmaker because I really love the Imperial Knights giant robots. Look around.