One of the Emacs features that I really like and use all the time is bookmarks. I have a lot of files that I use several times every day and it’s really convenient to be able to bring them up immediately1 without typing in a file path. This works even if the file is already in a buffer so I can always do the same thing to bring one of those files up. Since I use Bookmark+, I can also set a bookmark for Irreal and Emacs will automatically open Irreal in my browser.
There are a lot of things you can do with bookmarks that aren’t obvious so I was happy to find this (old) video on bookmarks by Aaron Camposs. It’s just 7 minutes long so it’s easy to find time to watch it. Once nice thing that I was only vaguely aware of is that you can set a bookmark to a file on a remote system as well as files on the local machine. If you spend a lot of time working with files on a remote machine, this can be a real timesaver.
If you aren’t already using bookmarks, you should watch the video and see what you’re missing. It really is a great feature of Emacs that everyone should know about.
Footnotes:
Using an idea I stole from abo-abo, I can usually choose the appropriate bookmark with a single key.