Triplet of Triplets
This trilogy of trilogies combines three sets of strategies together, with particular appeal for beginners.
First:
1) Corners, 2) Sides, 3) Center.
Second:
1) Make life, 2) Make strength, 3) Make an attack.
(It is ideal if two or three of these can be combined into one move or sequence of moves)
Third (shygost's "List"):
1) Am I vulnerable? 2) Is my opponent vulnerable? 3) Where is the biggest move or biggest open area?
As far as I (Hu) know, I am the first to put these three together.