The Elements of Content Strategy by Erin Kissane (also available from the publisher, A Book Apart, possibly cheaper. Support your small press publishers!)
Note: at the time of this writing, the paperback has been out of print for quite a while. I’m hoping that’s because they’re doing a second edition because this is a fantastic book. Meanwhile the e-book version is still available through A Book Apart through the links above.
As an Information Architect, I’ve dabbled in the more IA-like parts of Content Strategy for a number of years… but without necessarily knowing that’s what I was doing. CS has been a thing that the Documentation/Writing/Marketing teams did, not something that directly affected me. On the other hand, when I’ve worked with Content Strategists, we’ve produced better projects than I could dream of doing on my own.
Erin Kissane’s book, as a primer on content strategy, will provide you with a short history of the field, the kinds of skillsets that are adjacent to Content Strategy, the kinds of work that Content Strategists do, and the kinds of pitfalls to look out for as a Content Strategist.
If you know nothing about Content Strategy, pay close attention to the Design Principles provided at the beginning of the book. Strategists I’ve worked with who align to those principles have been highly successful; strategists who work off of “please the client” principles instead have caused nothing but disruption for otherwise on-track work.
For me, one of the biggest takeaways is that I need to learn more about editorial work if I want to pitch in as a content strategist as needed. Your takeaways will likely be different, because you likely don’t have my work history ;)