The do of the bass clef of the staff is on the top plus a line, and the do of the treble clef is on the bottom plus a line.

The first line from the bottom is called the "first line", the second line from the top is called the "second line", and the ones from the top are the "third line" and "fourth line", and finally The top line is the "fifth line".

Since there are so many notes, the gaps between the "lines" must not be wasted. That is, the place between the "lines" and the "lines" is called "the space", and these spaces are also natural. Counting from bottom to top. Just like the "line", the bottom room is called the "first room", and counting up are the second, third, and fourth rooms.

If the lines and spaces are not enough, you can add lines and spaces above or below the staff. The added lines and spaces are respectively called the 1st line above, the 1st space above, and the 1st space below. Line, add the first room, etc.