A bank-less currency is free of national monetary policies. For residents of countries that have destabilized fiat currencies, a decentralized currency can serve as a stabilizing agent and an alternative.
Crypto mining is a complicated process. It requires a lot of capital expenditures in technology equipment. And, it has significant expenses in terms of electricity and even cooling equipment for a large number of computers used.
Each Bitcoin is basically a computer file which is stored in a 'digital wallet' app on a smartphone or computer. People can send Bitcoins (or part of one) to your digital wallet, and you can send Bitcoins to other people. Every single transaction is recorded in a public list called the blockchain.