This song is similar to "Merrily", which you learned in Lesson 3 . The difference is the G note in the fourth measure. There is also an extra note in the sixth measure.
This symbol is called common time.
It means exactly the same as * .
Practice naming the notes out loud as you play this song. Other times, count as you play. This way you will remember the notes more easily and also develop a good sense of timing.