I'm not familiar with DnD 5e. I just leveled my Wizard to level 3. In DnD3e I could prepare a certain number of spells for each spell level. E.G. 4 level 1's, 2 level 2's, 1 level 3 etc
But it seems that in DnD5e (or maybe just this game) the number of spells has a shared pool between all the spell levels.
Again, I'm new to this but doesn't that mean casters will just prepare the high level spells and hardly any low level spells (because of this shared pool).