I'd also expect someone who knows not-that-much about the game to know that you don't want to aim to bowl length at the end of the innings.
Knowledge of what needs to be bowled can be attained by anyone; the skill to do it can be attained by precious few. To not have the skill to bowl what you need to is more common by an unspeakable amount than to not know what needs to be done.
I try to bowl Yorkers often. Quite often they end-up length balls.
BTW, just seen the Gambhir dismissal for the first time. Inside-edge, to a ball that turns accross you enormously. Exceedingly odd.