When I enter this blockchain, I tried to lean about mining. However, I looked at others' post which told me the story that their investment is much more profitable than the mining they did. Thus, I gave up. For one reason, it take more time and efforts to take care of mining. For another, it is not very secure since as I know in china these days is policy news that the mining is restricted and some big mining owner is forced to move to other countries. At last, it is not very profitable now because the profit is very sensitive to the price of electricity. If the elect price is a little higher you are going to lose. And, the advantage is belong to the big miner which has cooperation or good deal with local government.