Giving advice
Using should, ought to, had better
You should be dancing.
You ought to be more friendly.
You had better been good to him.
Strong advices using have to, must
You must do your homework!
You have to pass the exam.
Using imperatives
Start going to the gym.
Try cycling to work.
Start learning.
Suggesting and recommending
I suggest taking a holiday.
I recommend going to bed earlier.