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There is no need to create an emergency fund before investing. Because if you are not investing, then in my opinion, an emergency fund is of little importance. Invest first and then gradually build an emergency fund. Or if you have the money to create an emergency fund, then immediately create it as soon as you invest. Try to keep 3 times your disposable income in an emergency fund.
It depends on how comfortable someone is when they want to become an investor and want to invest in Bitcoin, because if an emergency fund must be considered an important option for them, then preparing it early and separating it from the amount of capital that will be used in the investment, I think that is also not wrong because in the end it must also be prepared by every investor when they have run their investment. So don't think of it as something unnecessary if in the end it must also be prepared by the person making the investment and besides having to have that, every investor must also have a long-term mindset and should not panic easily when they see market conditions experiencing a price correction.