Regarding the second point, the good practice here is starting the quote with a single > or if you quote more than one paragraph, simply inserting the whole quote inside of the " " signs. The spaces in front of the lines are supposed to allow code in the comments, and they introduce scrollable boxes in the text and the text is effectively unreadable on smaller screens as it can't be reformatted to the display cell width.
Regarding the second point, the good practice here is starting the quote with a single > or if you quote more than one paragraph, simply inserting the whole quote inside of the " " signs. The spaces in front of the lines are supposed to allow code in the comments, and they introduce scrollable boxes in the text and the text is effectively unreadable on smaller screens as it can't be reformatted to the display cell width.