I heard from someone that if you want to earn money without any investment then you should go to bitcointalk. But he also told me to keep alert. I created an account. I am feeling very confused but I am not able to understand anything.
Then keep alert...LOL
Your friend didn't lie to you, however he gave you a half baked information. He should be able to tell you that you need to contribute positively to the forum in order to rank up. When you rank up to atleast full member, you will be able to join signature campaign and start earning. Read the links people sent you and try your best to also learn from your friend that gave you the first information.