Many forum users know & use the forum Quote feature. It's super-helpful to know which post (or posts...) are being addressed.
But did you know there was a way to quote multiple posts? Look for a small button found at the lower-right corner of a post - it looks like a quotation mark in a dialog bubble with a plus sign. Click on it and it and the plus sign changes to a check mark. Select another post in the same manner, then choose Reply With Quote - the selected posts will be included in your reply.