To select multiple ranges, separate them with a comma inside the quote marks:
Range("A1:A10, C1:C10").Select
When you select multiple ranges, the first cell becomes the active cell:
Range("C10, B9, A8, B7, C6, B5").Select
In the above example, C10 becomes the active cell.
Write to Range
To write to a range you can assign a value like this:
Range("C1") = "Knock knock"
You can also set the .value property like this:
Range("C2").Value = "Who's there?"
You can mix Range and Cells to write to many cells at once.
Range(Cells(1, 1), Cells(3, 3)) = "Hello"
Write to Range (using Cells)
To write values to multiple cells you can use a For loop.
This is where the R, C parameters of Cells (Row, Column) come in handy.
You can use a variable to loop through a counter.
Dim Counter As Long
For Counter = 1 To 10
Cells(Counter, 2).Value = Counter
Next Counter
Here is the output of that code: