Key metrics shows you any 6 metrics of the stock at a time from over 80+ available metrics. This includes important metrics like PE ratio, dividend yield, EBIDTA, RSI etc. 

Tickertape pro members can edit the metrics to bring any 6 from the 80+ available metrics in the homepage. You can do so by clicking on the edit button at the top right where you get the option to edit any of the existing key metric.