Zhongguancun seo went to Yaran training. I studied there before. The address is East Fulton Center of Jinsong Bridge in Chaoyang District. This seo training class is a small class, which is better than Zhongguancun's. These teachers who teach seo are also very high-level and patient. If you are not at ease, you can listen to a class for free first, and then register when you feel better. After you finish studying, you will be qualified for this job in the future! Zhongguancun is not very clear.