%k line

why is it a SELL signal if the % goes below the %d line? if these are stochastic oscillators, wouldn’t the %k being low mean that the closing price is low? so that would be a buying opportunity no?

the formula for % is 2day’s close-lowest low/range so i must be missing something…

ALso- why is it that if a short-term average crosses above a long-term average, that is a buy signal? if we assume stoc prices flucctualte around a mean or a true value, why wouldn’t the short-term moving average crossing above the long-term moving average indicate a short-term overvaluaton and therefore a sell?

sorry for the wordiness-thanks