Almost every op-amp tutorial I came across online goes in depth with their explanation on input offset voltage and input bias current (and input offset current). Not many I find discuss the null offset pin on the op-amp (or the input offset voltage adjustment range), or if not mentioned at all.
Take the old LM741 for example. Adding together the maximum input offset voltage of 5mV and 200nA input offset current (a mere 2mV for 10k source impedance) is still well within the null offset adjustment range of ±15mV. All I really need is just a good quality, accurate pot to balance the op-amp inputs. So long as the null offset pins is provided, I might as well ignore the offset voltage and current in the data-sheet - just tune the pot!