Solo & Pool are the three methods of noncustodial staking. As you are familiar with mining, try to imagine that a wallet is ASIC, then the analogy should become clear.

BTC doesn't have staking in the sense of proof of stake. In fact, words like staking and farming sometimes are used to mean whatever. When I stated conceptualizing what and why Zero-Knowledge Finance, then described three types of activity as staking vs leasing vs lending. Interested in opinions about this.