Its easy and simple. Fierst of all you beed to learn about cryptocurrency if you want to earn bitcoins. The easuest way to earn bitcoin is to join a campaign. Or be a trader. Thats the easiest way to get bitcoins.
That is just the easiest and I have really not seen a way that is as easy as this. Joining a campaign is really a very good way to start. Signature campaigns, bounty, articles and so on, based on your skills can really be very useful. Also, there are some other freelance ways in which you can also earn a lot of bitcoin, but that totally depends on your level of skill set and knowledge in the crypto world.
I'm taking part of ICO's adversting and generate some btc by this.
There are so many ways to earn in the crypto world and it takes some patience, but once you are smart and you can make use of all the opportunists around, you can earn a lot. ICOs have really made it good to even earn either in bitcoin or in other new tokens which could grow hugely in future. It just takes serious effort, understanding of how to go about all this and not lagging behind.