I am planning to build a mining tool in my home. but before I do that.
I want to know some of the biggest problems in mining.
Would you guys tell me about that?
Do you mean you're going to build your own ASIC, or are you planning on setting up a mining farm by yourself?
In the second case, the number one reason people don't make any profit is the power cost... If you want to make some profit, it's best if you pay 5-10 cents/Kwu (the lower the cost, the better offcourse). At higher power costs, you might still be able to make some profit mining altcoins, but chances of ROI'in in a reasonable timeframe while mining BTC are getting rather low at these prices