How to put cursor on every line in Sublime Text?

Four steps:

1. Select all the text: CTRL+A
2. Activate multi-cursors: CTRL (or CMD on Mac)SHIFT+ L
3. Press the Home key to move all cursors to the front of the line
4. Press the " quote key to insert the quote.

Using the Home End and CTRL+left | right arrow keys is handy when managing multiple cursors.