I'm one of those weirdos that doesn't buy normal books. Mine are mostly Kuhnhausen technical manuals and Sweeney gun digest books from the early 2ks. They stay in a bin for reference and nostalgia purposes.
I do receive a hefty amount of cookbooks (all my friends and family no I'm a cooking junky), and random history and suspense novels. Cookbooks I scroll through and make not of interesting recipes, then donate to local animal shelter thrift store. Novels and such I put in the free library boxes around my area.