I want to know how to dig the bitcoin now, how to dig the bitcoin before, how is it different now? Is mining knowledge widespread?
it may better for you to visit mining section of bitcointalk forum, It's really difficult to mining bitcoin right now consider the difficulty and long-term return. Before 2016 bitcoin it's a bit easy to be mined by the miners consider the difficulty hasn't been getting an increase. If you are not active miners since the beginning of bitcoin and remember that. You will be lost in battle with asic miner.
yups.go to Mining Section here
https://bitcointalk.org/index.php?board=42.0But i warn you,if youre region has a high price of electricity please don't consider mining because its too expensive and you might end up losing or break even,so if were you i will find another source of income here than mining