The Vim editor can be divided into 3 modes, namely command mode, insert mode, and bottom line mode, as shown in the diagram of Vim's various modes of conversion.
Command mode: Control the movement of the screen cursor, the deletion of text, copying and other text editing work (do not use the [Del] and [Backspace] keys) and into the insertion mode, or back to the bottom line mode.
Insert mode: You can enter text only in insert mode. Press the [ESC] key to return to the command line mode. Many vim editor users want to enter content as soon as they open vim, but this is not successful because the VIM editor is just opened in command mode.
Bottom-line mode: Save the file or exit Vim, and also set the editing environment and some compilation work, such as listing line numbers, looking for strings, etc.
In some books, the Vim editor is simplified into two modes, and the bottom line mode is counted as the command line mode.
Three modes of VIM editor description