Design

is there a website that collects and serves good design case studies?

What kind of design case studies you are looking for? https://designresourc.es pretty much has everything

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Hmm, yea, kinda get what you mean. https://www.casestudy.club/case-studies This site might have what you want, but their problem scope is relatively small. If you are looking for something bigger, i would recommended looking into the top design agencies website, like Frog or Pentagram for example, they usually have very good case studies on their site.
https://www.frog.co/work/desigual-redefining-a-truly-unique-loyalty-model
https://www.pentagram.com/work/muriel/story

hate the fact that i have to use a vpn to access this but thanks!! this looks really helpful. 

as to what type of case studies, i'm not sure really, just want a sense of what a typical case study looks like. does that make sense?