How to insert a block of white spaces starting at the cursor position in vi?

Question

Suppose I have the piece of text below with the cursor staying at the first A currently,

AAAA
BBB
CC
D

How can I add spaces in

Answer 1

1. Ctrl + v (to enter in visual mode)
2. Use the arrow keys to select the lines
3. Shift + i (takes you to insert mode)
4. Hit space keys or whatever you want to type in front of the selected lines.
5. Save the changes (Use :w) and now you will see the changes in all the selected lines.