Trading on an exchange is one way to go about, but mining for bitcoins could be expensive nowadays. You can try reading up on crypto airdrops for the latest news how on you can get free Bitcoins and other tokens. Also there are some legit apps out there where you can earn Bitcoins. Me personally, I think you have more potential with trading altcoins and partcipate in ICOs than only focus on Bitcoins. -Just a thought!