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Just because you used it as an example here are a few quick resources to help understand filesystem layouts a bit better.

A real quick overview:

More in depth:

I prefer "man hier" at the command line. Much more succinct than either of those:

Cool! "TIL", as they say on reddit.

For non-redditers, TIL stands for "Today I Learned".

Agreed, and man hier is always there if you forget something, don't have to go track it down on the web.

However, I found these useful too when I was learning it. Sometimes it just helps to read different explanations of the same thing till it sticks: