Many modes of tuning bring out different sounds. The most popular modes are the Ionian mode and the Mixolydian mode. They are popular modes for the mountain dulcimer. Many tune it by ear. Musical notation can be used to learn to play or you can learn to play by ear.
Dulcimers are one of the easiest string instruments to learn.
You can go as far as your imagination will take you in playing the dulcimer. To hold a dulcimer correctly is important from the beginning. Find a low chair with no arms. The dulcimer will sit on your lap. The peg head will be to your left and the bridge to your right.