Should stocks buy all sectors or just a few sectors?

The common problems of novices seem to spread the risk, but it is not enough to buy one stock in each of two or three sectors. Retail investors have limited energy and technology, so it is impossible to concentrate. Since you have so many stocks, you might as well sell some. If you have enough risk tolerance, continue to chase hot spots and get rid of the current stagflation. On the contrary, we will put down the theme stocks and concentrate on stagflation bank real estate and the like. You can also mix the two, but don't be too scattered and concentrate on two or three stocks for easy management.