DietersMistakesIn2021/Solution26

Best  

White should apply pressure to the Black side. Even after it is not yet alive. So White has effectively separated multiple groups.

Locally, Black is now dead:

Mistake  

In the game allowed for an easy connection. In the game, I played a terrible slonection. It was sente but Black's response connected with territory, and suddenly my own stones were afloat.

Attack  

White can connect at then launch an attack on the top.