1.  Earn Bitcoins by Surfing Websites/Viewing ads
- this is generally faucet websites from which you can get cryptocurrencies easily. look at here: https://cryptodemystified.in/faucet/

2. By creating masternodes
- This is new kind of earning passive income. This requires investment but you won't have fear to loose it.

3. Mining cryptocurrencies
- just search online about it and you will have idea about it. Instead of using hardware, you can try cloud mining to on the platforms which provide free initial credits for usage.

4. By providing freelancing service
- examples, Jobs4Bitcoins, XBTFreelancer, Coinality, bitWAGE, CoinWorker. On these platforms, you can earn bitcoins for providing you service including writing articles, SEO, video creation etc.
    
5. Earn Bitcoin by lending
-there are many sites available where you can get bitcoins by lending your bitcoins. ex. bitbond, salt etc.

Last but not the least. BOUNTIES and AIRDROPS can you get you good amount of money.