Mutual Funds vs ETFs
Mutual Funds are actively managed by a fund manager or a full team (though passively managed fund have a bit of popularity)
ETFs are always passively managed
Mutual Funds generally have a minimum investment amount (e.g. in the $500 - $5,000 min range)
ETFs are bought and sold like stock and therefore are bought & sold similarly. They can even be shorted
Mutual Funds will almost always have much higher expenses, especially due to them being actively managed. The expenses can go towards many things like: paying the fund manager(s), paying for marketing, and more
Mutual Funds will buy and sell stocks and securities as a proxy for you
ETFs generally track a market index or sector sub-index