The four main ways to buy bitcoin are through Bitcoin wallet apps like the Bitcoin Wallet app, through Bitcoin website, through brokerages like eToro (buy Bitcoin on eToro here),and through cryptocurrency centralized exchanges (CEXs) like Gemini.
Equity in Bitcoin can be compared to equity in traditional financial markets, such as stocks. In the stock market, equity refers to the total value of an individual's shares in a company. In the same way, Bitcoin equity represents the total value of an individual's holdings in the cryptocurrency.