The Essentials of Emacs Bookmarks

Bookmarks are like registers in that they record positions you can jump to. Unlike registers, they have long names, and persist from one Emacs session to the next.

• Allow you to keep a list of commonly used files
  
• Allows you to record the exact place you want to "remember" in that file.
  
• You can bookmark almost anything, including PDFs, Folders, places in the Emacs manual and even remote locations using TRAMP.
  

So, the bookmark feature allows you to bookmark a file and its place in the document.

The prefix key is usually C-x r the same prefix key for registers.

C-x r m - Create a bookmark
C-x r l - Go to my bookmark list
C-x r b - Jump to any bookmark

This is cumbersome. I have adopted the shortcuts of the bookmark+ package.

  ;; Create a bookmark
    (global-set-key (kbd "C-x x m") 'bookmark-set)
  ;; Go to my bookmark list
    (global-set-key (kbd "C-x x e") 'bookmark-bmenu-list)
  ;; Jump to any bookmark (used rarely)
    (global-set-key (kbd "C-x x j") 'bookmark-jump)

Rename - r
Delete - dx