XLK's technology sector was last week's weakest group, down 7.5% and clearly below its 50-day moving average, with negative MACD and RSI crossovers and heavy selling; the speaker advises against overinvesting in these sectors.

Let's take a look at the weakest group last week, the technology sector, which fell by 7.5 percent. A clear close below this key 50-day simple moving average. Take a look at that development in trading volume .

And of course, we witnessed that negative crossover of the MACD indicator and the negative RSI indicator. So there are a lot of sell-offs going on, and of course we'll take a look at some of the weakest sectors in the technology field.

Make sure you don't overinvest in these sectors.