This is a super-short read (takes only 10 minutes to finish) and explains the single most important rule you should follow as CTO and Engineering Manager.
My full-time job is Engineering Manager at Meta. I am a former CTO of three organizations ranging from 50 to 350 full-time employees. I also co-founded a data analytics company which was sold to a large gaming company. (Lawyer-required note: the views in my books are mine and not those of Meta).