I believe there are lot of ways you can earn bitcoin, you can start on trading, investing or mining you just need to choose whats the best for you. For me i choose investing and trading i begin with small capital buying different coin and hold until i reach the price i want then sell it..it took me almost a year before i gain enough amount of bitcoin,
Im not a pro im just a regular guy who tried my little knowledge on investing by choosing whats best for me base on my little experience, knowledge and capital until i make some bitcoin..just be patient and keep learning.