I don't agree with everything on his list, but included are many great principles.
Here is why you should take me seriously. I was born in 1942. I have seen what works and what doesn't.
I have a Ph.D. I am rich by most Americans' standards. I have never been divorced. I am in good health -- and have been since age 9. I am content with my life. There is nothing that I want that I cannot not pay cash for. I spend almost no money on buying consumer goods, except for used books, because I own everything I want, and I have for 30 years.
Take my advice.
I could list these rules by order of importance or by chronology. I chose chronology. You must get into good habits now. Start where you are.