Some file operations in Dired take place immediately when they are requested.
Copies the file described on the current line. You must supply a file name to copy to, using the minibuffer.
Visits the file described on the current line. It is just like typing C-x C-f and supplying that file name. If the file on this line is a subdirectory, f actually causes Dired to be invoked on that subdirectory. See Visiting.
Like f, but uses another window to display the file’s buffer. The Dired buffer remains visible in the first window. This is like using C-x 4 C-f to visit the file. See Windows.
Renames the file described on the current line. You must supply a file name to rename to, using the minibuffer.
Views the file described on this line using M-x view-file. Viewing a file is like visiting it, but is slanted toward moving around in the file conveniently and does not allow changing the file. See View File. Viewing a file that is a directory runs Dired on that directory.