Safe & no $ investment way is to rank up in this forum and participate in signature camps. The higher the rank the greater your earnings, the minimum required rank is usually Jr. Member. You need to be selective of the campaigns though since a lot of them aout there can be scams. However as a newbie you can still participate in social media campaigns. On how to chose bounties as a newbie please check this out https://bitcointalk.org/index.php?topic=2941946.0