Always look at putt from reverse (hole) view.
Invest in a good putter with slower meter
Invest in balls with slower meter
Use the squares to align putts (many forum tutorials)
Focus on hitting ding
Green speed must be accounted for. One 11 greens: .85 X % @ 15', .83 X % @ 30', .82 X % @ 60', .8 X % @100'+
Elevation change must be accounted for. 1" drop in elevation subtract 1' off distance
Yips and Yaps kill you even when you perfectly aligned