It's safe if you don't give out your address of where you live. And also you've got to be old enough if a little one than I would seriously advise you to leave from this website at once little one. And await until you're old enough to be on here.
I once saw a young girl give her telephone number, others give their email addresses. If you don't do things of that sort, you should be safe. Just use common sense, and have fun answering questions, or asking some. Welcome to the site! :-)