VIM is a powerful editor with a rich ecosystem and many many features it's used by many users around the world in their daily administrations and development tasks.
This tip is very useful if you want to use VIM (mainly) as your source code editor.
1. Select visual mode
Check: VIM a powerful and flexible text editor to know how change from one mode to another.
2. Select the block using these keys
3. To indent right press
4. To indent left press