Lesson 5: Even after L4 you might still be 50% tech. Here's how to spread across sectors that respond to different things.Ten tech stocks — what are you really betting on?Go with your gut.What's a ten-stock, all-tech portfolio really a bet on?AThe whole stock marketTen companies is broad enough.BNothing in particularWith ten names, the mix doesn't matter.CWhatever drives techThe same forces hit all ten at once.