I am now confused, I want to ask you all, which one is better to buy altcoins or buy bitcoin, which can earn a lot, please give your answer
You asked 2 questions that are different. Whether to buy btc or alts and which can earn a lot. If you are mainly interested in earning a lot, alts are your best bet but they are riskier than investing in btc. Btc is safer investment but may not bring huge earnings.