Books You Need
You need to read because there is no substitution for learning new material. Increasing your vocabulary is directly proportional to increasing your intellect. You can learn important aspects of anything by watching someone, asking questions, etc. Nonetheless, reading core materials related to the craft or skill you are developing is the only way to gain a wholistic understanding of a subject. Understanding all the variables in a given situation thoroughly always leads to better decision making. So it's worth repeating again; Reading and and increasing your vocabulary is the only 100% proven method of raising your inteligence quotient!
None of these books or articles are deeply technical. But what I want to teach you, is what's been replaced by 1-button black-box technology in modern systems. Technicians that have no understanding of the underlying principals are poorly armed to deal with difficult situations or intense workflow environments.
We start with the basic ideas of sound reinforcement, Lighting correction, acoustic properties and simple physical principles.
All of these books are available for reasonable prices as used on several marketplaces. I've provided some links. Most of these are also available at the Internet Archive, which is 100% free.
Most importantly, I'm going to give you my book as part of the package when you pay for my classes. It's packed with a 165 pages of essential discussions about modern sound equipment. That's a $75 value alone.
Book 1; Sound Reinforcement Handbook by Gary Davis & Ralph Jones, Second edition.