Privacy

No, Bitcoin is pseudonymous. Every confirmed transaction is recorded on a public ledger that shows addresses, amounts and timing but not names, so once an address is linked to you, its whole history goes with it. The link usually comes from ordinary places such as exchange accounts. See Is Bitcoin Private?.

Often, yes. Specialized firms and researchers apply heuristics to the public ledger, such as assuming that inputs combined in one transaction belong to the same person, and combine them with exchange records. The heuristics are imperfect, but law enforcement uses this kind of analysis, so do not assume an address is untraceable. See Is Bitcoin Private?.

Mostly through ordinary routes rather than broken cryptography: withdrawals from an exchange that verified your identity, addresses given to merchants or posted publicly, and address reuse that lets outsiders see your activity in one place. A single slip can connect an address to you. See the Bitcoin privacy guide.

Common general practices include using a fresh address for each payment received, keeping coins from different sources separate, not posting addresses you use for personal holdings, and exploring wallet features such as coin control. None guarantees anonymity, and what is appropriate depends on your situation and local law. See Is Bitcoin Private?.

It means being able to save, hold and send value without depending on an intermediary's permission. If you hold your own keys, you decide when to spend. The argument is strongest for people facing frozen accounts or capital controls, and it comes with no fraud protection, no reversals and no deposit insurance. See Bitcoin and Monetary Freedom.