NextEra Energy had a big first half, beating the broader S&P 500. But there are some things to understand before you buy it.The utility sector is not exactly known for being a hot performer, but that didn't stop NextEra Energy (NEE -6.62%) from beating the S&P 500 index in the first six months of 2024. This impressive showing, however, needs to be taken with a grain of salt. Yes, NextEra Energy is a well-run utility with a fast-growing business. But it should only be bought by a certain type of investor.A l ...