How to prevent row insertion, column deletion, but allow certain values to be changed.

Maybe try this (without VBA) :

Step-1
1. Select all cells in the worksheet
2. right click, choose "Format Cells..."
3. Choose "Protection" tab
4. Have the "Locked" box unticked
5. Click OK

Step-2
6. Block row 1 to 11
7. right click, choose "Format Cells..."
8. Choose "Protection" tab
9. Tick the "Locked" box
10. Click OK

Step-3
11. Choose the "Format" menu tab
12. Choose "Protect Sheet...."
13. Tick the "Select Unlocked Cells"
14. Tick the "Insert Rows"
15. Tick the "Delete Rows" (optional, depends on you)
16. Leave the rest unticked
17. Click OK.

prevent any columns added in the worksheet

Because on step-3 you don't tick the "Insert Columns", it will prevent the user to add column in the sheet.

I am trying to prevent rows to be added between rows 1-11
I'd also like no values to be changed in rows 1-11

Because step-2 and because on step-3 you don't tick the "Select Locked Cells", user won't be able to click any cell within row 1 to 11.
Hence, there'll be no values can be changed in row 1 to 11 and there can't be rows to be added/inserted between row 1 to 11.

I'd like to be able to add rows anywhere else

Because step-14, then user can add rows anywhere besides row 1 to 11.
To add (or delete if you do step 15) row, right click the row number outside row 1 to 11.
There you have the option to insert/add (and delete if you do step 15) row.

edit values anywhere else as well

Because step-2 causing rows beside row 1 to 11 still Unlocked, then user can edit values on any cell outside row 1 to 11


Hope this get what you want.