Help with code syntax for moving rows

Hello. Someone gave me this code. Could someone explain what it is doing?
How does the multiple arguments in the range work? I didn't know you could do that. I don't get the nested for each...The first part is saying for each cell and then the second part is saying for each cell again but resize the cell? Is that resizing each cell? And then it's taking that resized cell and resizing it again? This code is simple but confusing lol.

What this code is doing is looping through three "tables", taking each row copying it below and offsetting the starting point one column to the right (so it's staggered)

Sub offset()
Dim cell As Range
Dim cel As Range


For Each cell In Range("A6,O6,AC6")
    For Each cel In cell.Resize(12)
        cel.Resize(, 13).Copy cel.offset(15, cel.row - 6)
    Next cel
Next cell
End Sub

1) The first part "For each cell in Range" ("A6, 06, AC6") sets up a loop through the three different tables, right? How does it know to do that based on just the first cells. I didn't even know that was allowed ha.
2) Then you are starting the loop but resizing to 12 rows. Aren't you doing this for each and every cell in the range? It seems like you would be looping too much.
3) Then you resize each cell to 13 columns? Copy it down 15 rows and over a certain amount of columns (iterates through loop).
4) The main thing I don't get is the for each/next setup. Wouldn't you be going through each and every cell in all of these ranges?

I still don't get it even after your explanation

It is indeed haha. Yes please continue to explain it thanks!! I'm trying to walk through it with F8.

Got it. Makes more sense now. Thanks for your help. I'd give you reputation but it says I've given too much out today haha.

Got it. Makes more sense now. Thanks for your help. I'd give you reputation but it says I've given too much out today haha.