How to comment out multiple lines at once in vim

My name is Ito and I am an infrastructure engineer.
If you want to edit files on Linux, you probably use "Vim".

When editing a configuration file, you
may want to comment out multiple lines at once when commenting out unnecessary settings.

This time I would like to introduce the method.

Use rectangular selection mode

For operations on multiple lines, use "Short selection mode".

After opening the file with vim, enter the command below.

ctrl+v

Enter "Rectangle Visual Mode".
Select the line you want to comment out with your cursor.

I (shift + i)

"Insert mode".

Enter the character to comment out (such as "#")

Esc

Exit insert mode.

I summarized it in GIF.

What do you think?
The comment out character has been inserted at the beginning!

Let's do our best to master Vim.