Depends on what you have in mind when you say diversification. Easiest way to get started in other sectors is to google for stock analysis articles. They are written regularly for the major sectors and they will talk about the biggest/most interesting players, where they stand in the industry terms in recent developments, competitive advantages and risks. With that said, dividing a portfolio across sectors isn't nece…
COVID freaked out the stock market last year. Then it rebounded due to tech companies bring such a large part of the index. Residential real estate did great dispute COVID in some markets.