Look at any candle chart and you'll see high, low, open, close (HLOC) for any candle. Even when the candle is red, meaning a loss for that period, you *could have still made money* by 'buying low' -- the L -- before it goes up to the close ( C ).
That is what #buyLowSellHigh means.
Some #BitcoinMaxi (-mum fiat (USD)) will cry, "don't sell!".
Money is to buy things and if you buy you are also selling, so if you buy a cup with BTC you are selling BTC and implicitly saying you believe the cup will get you more Bitcoin in the furture when you sell it. Or you just need a cup to drink out of because you can't drink out of Bitcoin.