While working on a project, or while browsing code I often open many buffers in emacs. There are often a lot of things that I am seeing in many windows. When the stack in my mind deepens I often forget what particular thing I was looking in some buffer/file which I opened 15-30 mins back. Is there a way where I can add a small note to these buffers when I open them, so I can always go back to them.
Thanks.
I would recommend looking into org mode's agenda feature.
From within the currently open buffer, you can file away a note to review later. You can set deadlines, TODO / WAITING labels, and most importantly, provide a hyperlink that will take you back to the exact location in the buffer you filed the note from. And you can recall the list of stored links from anywhere with a simple keystroke.