Vim split screen display

I use VIM to open a file, I want to open another file, just like windows open two Notepad, so need to split screen display

First open a file with vim

Vim File1

Input command [ESC]: SP file2

Split screen to open a second file file2

Toggle cursor:

[Ctrl] + W release all keys and then press ↑

[Ctrl] + W release all keys and then press ↓

command [ESC]: SP File2 also applies to the following conditions:

When I have a very large file, I look up to the back of the data, I want to control the previous data, this time the same file cut into two copies,

Split screen display, part of the display of the previous content, part of the display of the following, you can easily copy and paste work.

Vim split screen display