There are too many explanations now. First, there is no good material. Now many games don't put rep outside. Pis could have explained it. Now even pis is making videos. Second, many people like to see the first perspective now. Look at those who update the first perspective and explain it to them quickly. These are invisible from the first perspective of rep, so it seems that the original water ion elf Haitao has been slowly updated. The elves went to explain dota2.