The erhu, an ancient bowed string instrument, requires both skill and Xi to master its charm. The following will reveal how to play the erhu and help you walk through the door: First, you need to master how to hold the erhu. Place the stem on your left shoulder, gently press the stem with your left thumb and control the tension of the string with your index and middle fingers. The right hand holds the bow, the middle and ring fingers hold the shaft, and the index finger controls the position of the bow hairs. Your body will be part of your instrument, and every movement will be part of your playing. 
Before you start, don't forget to adjust the string notes of the erhu. The erhu has only two strings, the A string and the E string. Adjust the pitch of the strings through the tuning shaft so that the A string reaches the standard note A and the E string reaches the standard note E. Let each string sound as it should, and let ** start from the most basic level. Then, you need to take the basic playing posture. Sit up straight, keep it steady, and let the erhu rest on your thighs, as close to your body as possible. This will allow you to play more comfortably and feel the flow of ** better. 
When you start to draw the bow, gently touch the string with the bristles of your right hand. Pull the bow from the middle of the body, not pushing too hard, and maintaining an even speed. In the process of drawing the bow, try to make the bow hair evenly touch the two strings, so as to ensure the quality of the first. Once you've mastered the basics, you'll be able to start practicing Xi basic scales. Start with simple scales such as do, re, mi, etc., and gradually increase the difficulty to practice Xi arpeggios, trills, portamento, and other techniques. Each Xi practice will bring you closer to mastering the essence of erhu. 
Finally, once you've mastered these basic techniques, you're ready to learn Xi play erhu music. Choose some simple pieces to start Xi, and as your skills and expressiveness improve, you can challenge more difficult pieces. Learning Xi erhu requires patience and long-term Xi practice. It's best to learn Xi under the guidance of an experienced teacher who can guide you through the correct technique and how to play. Every practice Xi will be part of your journey towards the world, and may you find your own way in the world of erhu.