If it is an array, then you can use the TAPER modifier. In that modifier, there is an SCALE property>
Working with modifiers is part of the coming lessons. But only a small part are used / explained.
But for your problem … you could investigate the taper modifier.
I’ve used it in lesson 7 Church. To build a pillar with array and blocks. Making the pillar smaller at the top (taper). And I even did a small z-ax rotate. Church pillar with taper modifier.
Good luck.