Medicare is confusing

I’ve been trying to help my mom with her medicare and this shit is damn confusing.
You’d think since it’s made for seniors, they’d make it as simple as possible. But it’s not.
The worst part is, most people who are supposed to be knowledgeable to help seniors with this stuff cannot answers the questions I have.
Or they simply cannot answer it clearly because it is impossible to be clear about it.
From my current limited understanding, they have four different types of Medicare A, B, C, and D.
It’s nice that they gave it a simple alphabetic naming convention, but in this case it’s actually NOT helpful since it is completely non-descriptive and confusing.