雅思口语P2 Describe a person who taught you knowledge(文字版）

The person who taught me knowledge is my roommates in college, formally named, Jack. Jack looks rather tall, curly hair. But he is quite gentle and usually puts a smile of joy on his face almost everyday. Apparently, we all liked him. The point that I have learnt from this person has got to do something with money management. What I am trying to say is that he showed me how to spend money wisely. As it is known to all, young boys were not good at this point, especially when we lived independently after graduating from high school. He was a genius in this field. Meantime, several related books of economy and finance were recommended by him as well. Gotta be honest, I did learn a lot from his advice and attitude. I could say I become a good member of college students after knowing him. I even gave up drinking and smoking, you know. It used to be an important part of my financial support. Till now, those activities which were free of charge and healthy are my favorite. Such as reading and jogging for example. Thanks to his efforts, I made a change. That is it.