What should I do to earn bitcoin easily?
I think you need to specify what type of investment you want to do this before you make invest and if you don't have any info about investment itself, then i think you should search first the info, learn it with careful.
If you like learn to more youtube and google will also a good reference as its also can offer information.
Besides that, you can also find information about bitcoin, and altcoin in this forum. Then try to learn experience and skill from successful people here based on their real experience.
Good luck