how to write on multiple lines in vs code code example

Example 1: vs code edit multi line

Windows: Ctrl + Alt + Arrow Keys.
Linux: Shift + Alt + Arrow Keys.
Mac: Opt + Cmd + Arrow Keys.

Example 2: how to comment multiple lines in vscode

********** For Windows **********
-> How to comment a block?

CTRL + K + CTRL + C 

-> How to uncomment a block?

CTRL + K + CTRL + U

Example 3: select multiple lines in vs code

Ctrl + Alt + Arrow keys