I was asked whether I still use just fact sheets, or whether I encourage the use of a textbook like OpenStax.
I'm still using fact sheets, and nothing but fact sheets.
Many people have argued with me that they want to promote learning new physics from a textbook. Reading a textbook is a skill, one that seems to be demanded in college physics courses. Fact sheets and videos, they argue, eliminate textbook learning.
True. And I desperately want to eliminate textbook learning.
Textbooks are interesting and useful and fun to read for those who already have context. In history, where the vocabulary and general situations (kings, wars, human conflict and leadership, etc) are within people's experience or at least within their knowledge base, it's easy to learn from a textbook. Life science texts with outstanding diagrams can lead to good learning. Even language texts can be strong, especially if they include easily navigated glossaries and grammatical summary tables.
Physics cannot be learned from a textbook, I don't think. Instead, students can learn facts from a fact sheet by rote. Then they can learn the skills of applying those facts to interesting situations, and experimental skills in lab, and how experiment connects to prediction... and finally, at the end of the year, students can go read a textbook successfully because they have the context for understanding.
I think that process holds in first year physics as well as advanced physics - everyone I knew struggled to understand our quantum text, or advanced fluids text, or advanced E&M text. I thought I was stupid because I couldn't read and understand the textbook. My friends either also thought they were stupid, or thumped their chest and pretended to understand.
We all figured these subjects out eventually, as we did problems and learned facts from our teacher and practiced with each other. But the idea that it's a useful or even attainable skill to read a text and understand new physics the first time you read it? Utter baloney, in my mind. :-)