He have good full time job as software engineering (5 years experience).
He begin side hustle. He join a real estate agency. (which seem unreasonable because he should work in IT industry side hustle, which he have 5 years experience) But most of the time he taking class, and post picture of class on social media.
I am worries. It feel like a cult.
Real estate is where the money is.
Really depends on the type of class, etc. It sounds pretty benign the way you describe it.