1. Hardware requirements: Bitcoin mining requires specialized computer hardware called ASICs (Application-Specific Integrated Circuits) that are designed specifically for mining Bitcoin. These machines are expensive and consume a lot of electricity.
You don't need ASICs to mine bitcoin. You can use video cards or FPGAs and mine the most profitable coins. NiceHash and similar services will mine the most profitable coin and pay out rewards in bitcoins, or other coins from their list. You can use video cards in an apartment, unlike asics.