Asking for & giving advice: 
Asking for advice:
What should I do? What ought I to do? What do you advise me to do? What's your advice? If you were me what would you do?; If you were in my place/situation/shoes,... what would you do? What do you suggest?Giving advice:
Why don't you ...? How about+ gerund (verb+ing)...? Why not+infinitive... You'd better ... You ought to/should ... If you take my advice, you'll ... It might be a good idea to ... I advise you to ... Have you thought about+v+ing? If I were you, I'd... If I were in your place/situation/shoes, I'd...Examples:
If I were you, I'd see a doctor. Why not consult a hair therapist? Why not consult a hair therapist? It might be a good idea to brush your teeth regularly. I advise you to read English books a lot. Have you thought about watching English movies? You'd better not eat sweets.