Pete Whitaker’s book is a great reference for all things crack. On several occasions I’ve been fiddling around trying to find something secure, and a snippet from the book will pop in my head that locks me in bomber.
https://www.amazon.com/dp/1680512153/ref=cm_sw_r_cp_awdb_imm_T8KK27CK9N2FJTNM4J0J
Pete Whittaker put out a really good book on how to crack climb. It's fun to get thrashed on a climb and then look up the technique for it when you get home.