Definition: We all know what "advice" is. The reason the golf rulebook addresses it is because you're not allowed to seek it or give it from certain people or under certain circumstances on the golf course.
Rule 8 in the rulebook addresses advice. Sharing information on the rules, or advice on matters considered "public information" - e.g., where a hazard is, or where the flagstick is on the green - is allowed under all circumstances.
Giving other advice that might influence another player's choices is prohibited ... unless you are playing partners. Then you are allowed to offer your partner advice. You are also allowed to seek advice from your partner, your caddie or your partner's caddie.
You can always seek advice from your own caddie.
