Vim copy and paste multiline text

Method 1:
Place the cursor in Row 3,
Input: 2yy
Place the cursor in Row 3,
Input: P
This method is suitable for copying a small number of lines of text. Copy two rows of data under 6th rows (inclusive) and put them under 9th rows.
Method 2:
Input in Command Line Mode
6, 9 co 12
Copy the content between 6th rows and 9th rows to the end of 12th rows.
Method 3:
You can use tags to replace the number of rows that you do not want to read or copy a large number of rows.
Move the cursor to the starting line and enter Ma
Move the cursor to the end line and enter MB
Move cursor to paste line, input MC
Then: 'a, 'B co' C. Change Co to m and cut it.
To delete multiple rows, you can use: 5, 9 de