The Subtle Art of Not Giving a F*ck: Enjoyable read or audible book. Funny and sets perspective in life.
How to Win Friends and Influence People: Classic and great to teach about communication with people.
Nail it Then Scale it: Great business book for nailing the business model then scaling.
Buy Then Build: Is a good book if you are looking to purchase an existing business.
Crossing the Chasm: Tech based but can be for a company hitting flat sales after a successful launch.
The 4-Hour Work Week: Are you looking to escape your W-2 job and start an owner absentee model?
(I have more but these were my favorites this year)