I'm 36 and I have over 20 years experience playing, what I will teach you is not going to be what Grand masters will teach you. Infact if a GM did grace one of my games with their opinions. They're properlly tell you it's all crap.
But the thing is how we play and how Grand masters play is very different. They play book by book, You don't. You don't even know the book to play by the book. So how can you play by it if you don't even know it?
A beginner starts off and learns the basics 101 stuff.
The stuff I teach you, is how to get your teeth wet in blood as you sink your teeth into some people with slightly higher numbers than 1500.