I'll do it for him.
He want's to be able to see what a class' will unlock on every level from 1 to 10, that way he can plan out his character more. Most players of 5e does this, because the whole progression is available to them in the players handbook.
Knowing what's available at later levels will inform how you make your characer.
Imagine a new player, not knowing how leveling in DnD works, might think they'll get Ability Point Increases every level, so specs their character "broadly", only to realize their Cleric only gets it at level 4 and then again at level 8... won't be a happy player.