It really depends!! When I write fanfiction, I usually do just bullet points- one point for each major scene. With my last book, I did a similar kind of outline, although each bullet point (1 per chapter) was fleshed out to a paragraph.

With the book I’m currently working on, I’m trying to write a pretty in-depth outline, so I can figure out my plotholes and weak points before I reach them and get stuck. It’s all trial-and-error at this point, I guess!!