You can focus on the most important things, but knowing everything and doing everything is impossible. That's why division of labor
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It is not about being a specialist in everything, obviously you will not be a surgeon, but I assure you that it is not very difficult to know more for example than the average doctor and therefore you will be able to take better care of your health.
That's what I mean by important things :) something that is crucial for you and your family. But not every field is like this, that's why I say that ""everything"" is too much