Unlike required schooling, this request implies a, often self-driven, desire to acquire specific, tailored knowledge.
Asking someone to be your teacher, or professional mentor, should be done professionally and respectfully: Be My Teacher
Instead of saying "teach me everything," define what you want to learn (e.g., "Would you be willing to mentor me on my presentation skills?"). Unlike required schooling, this request implies a, often
Express admiration for their specific accomplishments and explain why you chose them. Unlike required schooling