Mixed ability

Hi,

I’m new to coaching - but have a dilemma with mixed ability.

how do you cater for mixed ability in training drills (hard enough for the more talented players, simple enough for those that aren’t)

also, on match days… for example, winning 1-0 in the cup, 10 mins left and you’ve 2 players on the bench who turn up each week but have never show progression in their ability… is it fair to not bring them on? In the flip side, is it fair to bring them on with the very real chance you’ll concede in the last 10 and potentially lose the game?

may seem a harsh question, but one I’d love advice on!