Which hands to open-raise
Preflop is the easiest street to play well: when the pot is unopened, you either raise or fold. Which one depends on your cards and your seat — later position, wider range.
Three defaults do the heavy lifting: no open-limping (raise if you play at all), fold most hands (even the button folds more than half), and widen by position — UTG opens ~13% of hands, the button ~38%. T = ten, "s" = suited, "o" = offsuit.
The charts
Gold = open-raise. These are solid teaching defaults, not gospel.
AAAKsAQsAJsATsA9sA8sA7sA6sA5sA4sA3sA2sAKoKKKQsKJsKTsK9sK8sK7sK6sK5sK4sK3sK2sAQoKQoQQQJsQTsQ9sQ8sQ7sQ6sQ5sQ4sQ3sQ2sAJoKJoQJoJJJTsJ9sJ8sJ7sJ6sJ5sJ4sJ3sJ2sAToKToQToJToTTT9sT8sT7sT6sT5sT4sT3sT2sA9oK9oQ9oJ9oT9o9998s97s96s95s94s93s92sA8oK8oQ8oJ8oT8o98o8887s86s85s84s83s82sA7oK7oQ7oJ7oT7o97o87o7776s75s74s73s72sA6oK6oQ6oJ6oT6o96o86o76o6665s64s63s62sA5oK5oQ5oJ5oT5o95o85o75o65o5554s53s52sA4oK4oQ4oJ4oT4o94o84o74o64o54o4443s42sA3oK3oQ3oJ3oT3o93o83o73o63o53o43o3332sA2oK2oQ2oJ2oT2o92o82o72o62o52o42o32o22
Drill: raise or fold?
Random seat, random hand, folded to you. Make the call.
Why does the seat matter so much? Refresh positions — and when someone raises before you, that's a different (tighter) story we'll cover in the 3-bet lesson.