Bitcoin counts, not brushes. You can use your own computer to calculate at home. This calculation process is commonly known as "mining". But it takes a long time for home computers to work out a bitcoin. According to the current global unified computing difficulty of Bitcoin, it takes almost 2000 years for a computer with an i5 processor to calculate one. Therefore, many people buy a "mining machine", which is a device specially optimized for the generation and calculation of Bitcoin. It takes about 10 days for a mining machine that can process 600GHash data per second to generate a bitcoin. This kind of machine is also very expensive!
In addition, the price of Bitcoin fluctuates too much, from $900 in the past two weeks to $280 now. Therefore, it is not cost-effective to dig bitcoin yourself. The input is large and the output is uncertain.
A little more reliable is to invest in bitcoin or bitcoin futures, and you can judge for yourself how long you are short. But the risk is great.