And how's that different from trading?
As to me, trading also involves "picking some asset" and waiting until you want to close your position ("ready to exit"). Further, "changes in value and market fluctuations" are essentially the same thing. Market fluctuations is a general term for changes in the price (value) of a specific asset over a certain period of time. Personally, I'm inclined to think that a major difference between investing and trading consists in that with investments you are trying to earn primarily via price change (i.e. looking for a maximum price spread between your entry and exit points) while with trading via volume (i.e. looking for a maximum trading volume with a specific price spread)