The best method to do it withouth lossing a penny is to use faucets
Fauceting is a good option for new comers, but it probably is not the best risk-free option, there are plenty more options out there needs just a small research that pays you far more then faucets in less time consumed, claiming small amounts of bitcoin from faucets is actually wasting your time if you have some experience in bitcoin world, but if you are new to it then fauceting is the best way for you.
Faucets will surely waste your time, but a newbie can go for it to start earning free bitcoin, but the better way to starting collecting btc is from a signature campaign.