Specificity is good. When I was learning to sail, I didn’t buy an encyclopedic tome of everything to do with boats. Instead, I bought a handful of focused problem-solvers with titles like Manoeuvring at Close Quarters Under Power (Johnson), Single-Handed Sailing (Evans), and Living on 12 Volts with Ample Power (Smead and Ishihara). These books were valuable not in spite of their specificity, but because of it.
