User interviews have become a popular technique for getting user feedback, mainly because they are fast and easy. Use them to learn about users’ perceptions of your design, not about its usability.
Interviews
User Interviews: How, When, and Why to Conduct Them — NN/g
Knowledge
How to Maximise Traffic to a Bootstrapped Product Hunt Launch
Information Architects are the Architects of Understanding. They “help users to understand where they are, what they’ve found, what to expect, and what’s around.”
Information Architecture
Information Architecture (4 Parts) — UX Knowledge Base Sketches