Guidance/Training: Understanding 4-Stroke motorcycle engine and carburetor basics

I recently purchased a 1996 Honda 250 and I would like some guidance in understanding the basics of a 4-stroke engines, carburetors, adjusting idle speed/lean mixture, basic maintenance protocols, etc. My grandpa was a biker and would have been this resource for me, but sadly he passed away before he ever got to see me with my first bike. I have spent lots of time on YouTube and in the owner's manual figuring things out for myself, but it would be very helpful to have someone with firsthand experience explain to me what I am doing right and what I am doing wrong. As useful as YouTube and the internet has been, I am a hands-on learner and could really benefit from having someone show me in-person some of these things.