Seven years ago I took remote Go playing lessons from a South Korean professional player. I stopped after about 5 months and started using CS Pro Go on my iPad

Seven years ago I took remote Go playing lessons from a South Korean professional player. I stopped after about 5 months and started using CS Pro Go on my iPad Pro and it has a nice teaching feature of rating every one of my moves so after a game I can see where my biggest mistakes were. This is different than pro players learning new surprising strategies, for me it is nice to use.