Here are a couple of my all time favorite business books

https://www.amazon.com/Crossing-Chasm-3rd-Disruptive-Mainstr...https://predictablerevenue.com/https://www.amazon.com/Challenger-Sale-Control-Customer-Conv...https://www.amazon.com/The-Lean-Startup-Eric-Ries-audiobook/...

For practice you can buy several fire extinguishers at a hardware store and then walk in your neighborhood trying to convince people to buy the extinguishers from you.

Such a field experience is very valuable.