I am completely new to Bitcoin. I am trying to connect Slushpool using BFGminer, but its showing some USB device not detected? I am a newbie and don't know which device it needs. What should I do?
The best gaming PCs gave up in 2013. Now you need ASIC hardware to mine. Even 1 TH/s (1000 GH/s) is not fast anymore - I wouldn't buy slower than that. The device bfgminer is looking for is an old and slow ASIC that connects to the USB port of your PC.
Modern miners are stand-alone machines which connect directly to your network, not to your PC. You don't need your PC or bfgminer for the mining. You use a browser on your PC to configure the miner, after that it mines on its own.