I have a question about a previous code I saw for maintaining outlines in a
protected worksheet. DP, if you read this, need your help - the code was one
you posted for someone.

Before the code, your wrotes:

If you already have the outline applied, you can protect the worksheet in code
(auto_open/workbook_open??) - What does this mean?

The code is as follows:

Option Explicit
Sub auto_open()
With Worksheets("sheet1")
.Protect Password:="hi", userinterfaceonly:=True
.EnableOutlining = True
.EnableAutoFilter = True
End With
End Sub

At the end, you also add that it needs to be reset each time, what too does
that mean?

Two other small questions
1.) - what is the code doing exactly (I just need to understand what it says
in simple terms which helps me understand and change the code if necessary)
2.)And two, everytime I paste it, the "Option Explicit" always pastes
separately. Should I be pasting this under View code on worksheet or
somewhere else? (I admit, my programming knowledge is limited but I can
understand if it's explained)
Thanks in advance.