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.
If you are only focusing on earning then you should leave the forum because it's not for a forum to earn only. You have to be dedicated and too much helping nature to push your account to a Full Member rank minimum to earn from Signature Campaigns.
I I will suggest you to learn about from post and read too much post then you will get knowledge about this forum. It is a place where to discuss about Bitcoin and many more things about crypto. It is not a "come and join to earn from forum". It is a discussion place where people discuss about Bitcoin, Cryptocurrencies and many more.
So Better you should check Bounties section or Services section if you want to earn without investment. But in service section you have to be skilled so that you can offer your skills for money.