Yeah.
If you're giving advice to someone, always see if you can cite a source that they can go to in order to learn more themselves. Like if someone is considering suicide, link them to the
suicide hotline. If someone is looking for advice on how to work out,
back your ass up with advice & facts. If you learn things within five minutes of looking up stuff like this, you don't know what you're talking about: Stop what you're doing, and do some research if you really care. If you don't, delete the post, move right along.
As for emotional issues, it's really a person to person basis. You really probably shouldn't be playing as someone's therapist though: You're not qualified and you're usually never given all the facts. Don't give advice to people about their family situations for example: You have
no idea if what the person is saying is completely true. What if their view of the situation is coloured with extreme bias because they're having an emotional meltdown? Suddenly, things which you and I might interpret as "simple parenting" to them might be interpreted as "abuse." If you try to tell them to think clearly, they might get offended and bottle up further instead of expressing in a healthy way.
Don't play armchair psychiatrist, it's not your job, and when I catch friends doing it, I slap their shit and tell them to lay off. Unless you know that person well and you know their life and the circumstances they're living under, don't give them advice. Just empathize if you really care, and try to learn more, get them talking. Who knows, after a few hours of talking and blowing off steam, that might be all they need to feel better: Just someone to listen, not give advice. (Hell, if anyone here has seen a therapist, you know that half their job is just listening to you and probing you with non-invasive questions to try and help you come to terms with your own issues on your own. They equip you with the knowledge to fix yourself.)
Seriously, if I could, I'd pin this to the top of the Counseling section. On more than one occasion I've caught people giving advice that is either damaging or
outright potentially lethal. It's one of the reasons I tend to loathe the section myself.