Give advice.
For example : first of all, you should/shouldn't.... This way...

I got bad marks in my exams and now my parents want me to quit the footbal team. Footbal-is my life! Help!

First of all, you should do your homework well. This way will help you to get good marks.

You shouldn't spend money on unnecessary things. This way will help you to save your money.

thank me later :)