If you are looking to earn bitcoin, you can start by rendering a service based on the skills you have as there is no better way than that. Any other way, you may end up losing your money.

Another best way is trading, but without knowledge you will not be different from you gambling anyway since you will be trading with no strategy and you will need a lot of patience to at least be able to do it well and right. There are also so many other ways you can do so even on this forum and you can hit the beginners forum to see where you can fit in.