I read and clip case studies into Evernote. That gives me a persistent local copy to which I can save local links as I also 1) write commentary on them and 2) use them in design decision documents. They help inform my product design more than "how to" articles because they usually offer more explanation of WHY. One of the very best I've read this year https://www.uxfol.io/project/04f7271c/Add-a-Feature--Setting-the-conversation-level-with-your-Uber-driver