|You can also click the little box directly above the row numbers, to the left of the column letters. One click, all cells selected.|
You can also use F5 (Go To) which offers quick access to any Named Ranges in the workbook as well as some built in Selection options via the "Special" button.
If you need to select a specific region/regions on a consistent basis, then create Named Ranges and select them via F5 or the Name Box above Column A
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