The best advice for a newbie is: investigate how the Keys work... and learn which sites you can trust with your keys. Basically, it's SteemIt.com and SteemConnect.com.

If any other site looking like SteemIt asks your for the keys, check out the address first. If it's not one of the above two addresses, ignore it and don't give out your Keys.

PS: I've found your post because @macoolette featured you in her entry for The Pay It Forward Contest