There are two staves which make up the Grand Staff. The top stave uses the Treble Clef to identify notes and the bottom stave uses the Bass Clef.
The lines of the grand staff
First we look at the lines in the top stave. This is the treble clef (also called the G clef) stave.
These are the first five letters of the pattern E G B D F from the bottom line to the top line. As long as you know the order of letters and to begin on E, you can always work out a note by starting from the bottom line and working through the sequence of letters.
The lines on the bottom staff also follow the same sequence of letters, but for the bottom staff we begin on G. So the lines of the bottom staff are G B D F A
The spaces on both staves also follow the pattern!
The spaces on the top staff begin on F in the sequence and because there are 4 spaces the spaces are F A C E, so the spaces in the top staff are easy to remember because they spell FACE
The spaces on the bottom staff begin on A in the sequence and because there are 4 spaces the spaces are A C E G.