A young music student with some basic competencies might be comfortable with these kinds of rhythms: But these are a little trickier to pull off well: Divisions of the pulse into twos and threes is simple enough conceptually, but in most cases we really learn those kinds of rhythms better by ear—we just learn what ...
There are a number of advantages to careful hand positioning, and on a well-designed instrument it's also really easy: just put the tips of the three middle fingers of each hand on the corresponding key touchpieces.