re: ETF vs. Mutual Fund

All the stuff that Hizzy said and ETF’s can be easier to sell off or get rid of if you decide to make a sudden change, for instance, my brother has a Fidelity account and last year about the time COVID and other factors affected the markets in March/April, he had been increasing his investments and had just moved several thousand dollars into 4-5 Fidelity mutual funds. Within a week the market started dropping and he was panicked trying to undo the investments he had made 7-10 earlier.
The mutual funds don’t sell real time and there’s wait times and he got alerts telling him he was making “round trip” sales and they may violate government investment rules. He was able to go ahead and sell and took less loss than he would have later but he was blocked from buying Fidelity mutual funds for 90 days, which got him started buying ETF’s.