Simple Moving Average Reading, what happens next?

What happens next?
I can’t find anywhere to explain this
Been searching YouTube for hours watching videos that don’t explain this

Please help

I’m not sure but this is what I was told to use and it works and switch to candlesticks for a better overview

Use both an SMA and shorter term EMA. When the EMA crosses above the SMA (on any time frame) then BUY. Make sure there is a lot of volume at the start of this crossover. When the EMA crosses below the SMA, sell. For example, on the daily chart, use a 50SMA and a 15 EMA. Go forth and $$$$$$$$$