The novice just went to the gym for two days and his arm ached. What happened? Do you still have the strength to do it next time? How often do you have a rest?
Generally speaking, if you are a beginner, you'd better do adaptive training first. Don't put on too much weight. One group can do 12- 15, and the number of groups should be from small to large. The number of groups can be controlled at 5- 10. Only by adjusting your muscles can you gain more weight. Remember to be prepared before exercise and stretch after exercise. Usually, if you don't rest for too long, two hours of exercise is enough. If the muscles are sore, take some tonic and rest for 3-5 days. Muscle soreness is normal. If the beginner is not sore, it means that he has not practiced in place.