As been said, there is no free something when you gain something. You should invest something.
Having said that, if you do not have any money to spare to invest and join trading, you can invest your time instead perform a few tasks from the signature campaigns, or join telegram and/or airdrops to earn a few coins. Of course you can also join in translation bounty, facebook, twitter and the likes to earn a few coins or tokens.
But you need to become a jr member first to be able to join these bounty campaigns.

Here is a guide on how to: https://medium.com/@mishraritz/bounty-campaigns-beginners-guide-how-to-join-select-bounty-campaigns-e575d67cdd73