I'm still trying to brush up on Sudoku after my long absence.
Can someone point me to a list of Sudoku techniques by difficulty level?
Specifically, beginner techniques. I remember I didn't master all the beginner techniques, which would be the next level up from the Trivial stuff.
I think if I master those, I should be on solid ground to solve problems rated 6.0 SE to 6.5 SE without difficulty.
Quads, X-wings, and Skyscrapers would examples of beginner level stuff. If I recall, there was a list of around 20 or so things to master before intermediate level stuff.
Any list is somewhat objective: the techniques range from close to trivial, and some are closer to intermediate level... and everything in between. But any list gives a person an objective goal to try and master before delving into a more difficult set of techniques.