Take a look at decentralized exchanges, or just exchanges that don't require KYC:
https://kycnot.me/. You can find various privacy respecting exchanges, in some of which you don't lose custody either.
The answers to your question are the same as the answers to those other two questions:
Plus: you can create bitcoins, and give them to yourself. You can't create fiat currency, unless you're the banker who issues it.
You really can't. Satoshi created bitcoin. Now it exists. You can create an altcoin if you want, but you can't really create Bitcoin.
What you can do is:
- You can provide a product or service and accept that money in exchange from anyone that wants that product or service.
That's what solo "bitcoin mining" actually is. You are providing a service for the bitcoin network, forming consensus through a method using proof-of-work, and in exchange, the users of that network allow you to receive some bitcoins as payment for that service.
Some of those bitcoins are provided as transaction fees from the users that are currently sending transactions, the rest are provided as a form of inflation reducing the value of everyone else's bitcoins.
If you're talking about mining with a mining pool, then you are just providing a hashing service to the pool operator (essentially leasing your hashpower to them), and they are paying you for that service with some of the bitcoins that THEY earn from the Bitcoin users by providing the service of forming consensus through a method using proof-of-work.