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Newbie question - Brokerage and selling shares
Capital gains tax is an income tax upon your profit from selling investments. Long-term capital gains (investments you have held for more than a year) are taxed significantly less than short-term gains. It doesn't limit how many shares you can sell; it does discourage selling them too quickly after buying.  You can balance losses against gains to reduce the tax due. You can look for tax-advantaged investments (the obvious one being a 401k plan, IRA, or equivalent, though those generally require leaving the money invested until retirement). But in the US, most investments other than the house you are living in (which some of us argue isn't really an investment) are subject to capital gains tax, period.