C-x C-j (jump to directory)

    Open the current directory in Dired (requires that
    you first (require 'dired-x)) from any buffer, even
    other directories, but usually from within files.

    C-x C-q (edit directory)

    Start editing the current directory as a plain-text
    buffer and commit changes with C-c C-c or discard
    all changes with C-c C-k.

    One thing you can do with this is quickly swap two
    filenames. Dired will give one of them a temp name
    which is super convenient.

    Combined with multiple-cursors package, this also
    lets you mass rename files in ways that would be
    much harder in terminal.

    d (delete)

    Mark items in directory for deletion, (x) to commit.

    m (mark)

    Mark items in a directory for:
    
      R - rename (or move)
      C - copy