Remember to play notes for their full duration. For example, a whole note should last 4 beats and a half note should last two beats, but beginners often cut the notes short.
With that said, the following symbol is called a breath mark: 𝄒
A breath mark indicates a convenient place to take a breath. In order to do so, you have to steal a tiny bit of time from the last note before the breath mark. Quickly inhale a full breath through your mouth, not your nose, expanding your stomach area rather than your chest area.
Point to the breath marks in Mary Had a Little Lamb. How many breath marks are there?
The next song in Unit 1 is Sou Gan.