Complete quote: "This might be a hot take. In terms of jungle, there is nothing difficult about playing a jungler. You can reach the highest level of almost every single jungler, there's a few exceptions (Rengar, Nidalee type of jungler). There is nothing a good player doesn't know about a champion in 10 games. You can't tell me I don't know to play Xin Zhao because you just play him 3 times and you already know everything. The only thing that is difficult is specific interactions between champions. There is no laning in jungle, so there's no "Oh he's going for this minion and I need to do this because of this in this matchup", there's nothing like this in jungle. Most of the time, the things you're doing are based on the champions you have in your team that you're playing for. So jungle is very easy to learn"

Source: DonJake