The pandemic taught us all that the world and life are not static but dynamic. Things change and you should have 3 to 6 months worth of emergency funds to take care of things when your income has taken a dip. This is suitable for those who are employed and self employed
For the entrepreneur you need much more than emergency funds so that you can seize opportunities when these happen.
This applies mainly to property ...when the 3 Ds happen involved people want to sell in a hurry and you can get good bargains
With opportunity fund you can buy luxuries and income generating assets eg businesses therefore you must always have cash in your opportunity fund