Let's define this shall we? Traditionally a "lesson" refers to a one on one educational meeting between a student and a teacher. This teacher is your, the student's, coach: customizing each lesson and each response to your own playing. He/she is an accomplished professional who understands both the subject and how people learn to do it.
This is all hugely different from the common online or Youtube “lessons.” These are very often put on by 'guys who play' and may or may not know much beyond the one riff they may be demonstrating. Huge. Difference.