Aji xấu là gì và làm sao để lại ít đi

My favourite pro is Gu Zihao 9p. He is a top professional whose moves I understand the most among other pros (or at least I think I understand lol). I think his style is very honte and aji-free, while also maintaining pressure on his opponents. I recommend his games to anyone who is interested in solid play at the highest level.