There are a total 6 heists in GTA 5 which you should take a look at and definitely play at least once. Here are the top 6 heists in GTA 5.
Credit: youtube.com/GTA 5
Credit: youtube.com/GTA 5
Credit: youtube.com/GTA 5
Credit: youtube.com/GTA 5
Credit: youtube.com/GTA 5
Credit: youtube.com/GTA 5