Dune will just use words that it has never explained and trusts that you will figure out what they mean eventually

It's like if Star Wars never has that scene where Obi-Wan explains to Luke what the Force is

It's probably a book best read after you've absorbed some of it through cultural osmosis

I had to reread the second chapter four times, one of the times after getting through the first two thirds of Part I, to really comprehend the conversation that happened there