Rambling article which I couldn't follow but because the very first idea was that bitcoin could be considered a "pot" that you "put money into", I know the rest

Rambling article which I couldn't follow but because the very first idea was that bitcoin could be considered a "pot" that you "put money into", I know the rest will be quite wooly. Buy bitcoin, money goes in, sell bitcoin, money goes out? But every buy is a sell and the same money goes "in" and "out" simultaneously. There is no pot at all, it's just traded.