Bitcoin enters the market by miners selling some of the bitcoins they receive as rewards, in order to pay for their operating costs.

You can acquire bitcoin by buying on a peer-to-peer trading platform, by accepting it as payment for goods or services you offer, as a gift, or by mining it. (A very last resort, not recommended, is to buy it from a registered exchange).

When you receive it, you are technically receiving the private keys with which to access your bitcoin.

Remember: The bitcoin itself never leaves the timechain.

You can acquire bitcoin either anonymously, or with ID verification (KYC - Know Your Customer)

KYC is required by law to fulfill AML (anti-money laundering laws) when buying from exchanges.

Buying non-KYC bitcoin preserves your right to privacy in the future.