A dot written after a quarter note indicates that you should hold the note for one and a half beats. A dotted quarter note is often followed by an eighth note.
This well known melody written by classical composer Brahms makes use of dotted quarter notes in bars 1, 3, 9 and 13.
The next song contains first and second endings. The first time you play through the song, play the first ending, ( Z ), then go back to the beginning. The second time you play through the song, play the second ending ( X) instead of the first.
Jingle Bells is one of the most popular Christmas songs. Play to the end of bar 8, then go back to the beginning and play through the song again but play bars 9 and 10 instead of bars 7 and 8.