Gwei is the one-billionth of one ETH (1 ETH is 1000,000,000 Gwei). It’s a denomination of ETH, also called a nanoether, due to its value relative to ETH. Essentially, Gwei is that fraction of ETH taken as its gas price.
Hashrate
The hashrate measures the mining speed of your CPU per second, and the unit is hash/sec. Thus, miners put in resources to ensure their CPU