Some things I can't wrap my head around

I can never seem to wrap my head around what you do with money once it is invested, for example if you have 500k in a brokerage account, what are you supposed to ultimately do with it? If you decide to cash out one day wouldn't you have to do it over a decade in order to minimize capital gains taxes? If you decided to buy a house for 500k and had to sell all your stocks and pay the 500k outright you wouldn't be able to because you would then have to pay taxes on your capital gains (say its 250k

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