I have a front door (double doors), a side door that opens into the kitchen towards the back of the house, and a back door that opens onto my covered patio.
I use the front door most of the time. I use the side door to unload groceries. I use the back door only to go into the back yard.
The mailbox is by the front door, so I can pick up my mail as I go inside after work.
Wish I had an attached garage like Wrigley!! I am planning to have one in my ER home, once I have moved north. Then I'll just enter and leave through the garage.
Edited to add: I forgot that I also have French double doors leading from the bedroom onto the patio. I have never used them even once!! When I bought the house, they were a big "plus" as I saw myself opening them to sit on the very private patio in the evening just before bedtime, and so on. However with the humidity, bugs, and wildlife I have never been inspired to do that.