Can anyone share some information about this ?
Mining is the use of a set of graphics cards.
In order to get bitcoin
a web site from using the software.
The program takes 1% of the profits and 1% of the site in addition to electricity consumption,
which may reach 15% and more than the total profit in the month.
1.- Mining can be done with other hardware than graphic cards, it can be done with CPU, asic miners and sha256 miners. Even some coins can be mined with hard disk (burst coin)
2.-Mining isn't done to get bitcoin, each block has a reward but get that reward isn't the main goal. The goal is to confirm the transactions adding a new block to the chain.
3.- That 1 % is only in mining pools if you do solo mining all the reward will be yours.