There are a few different ways of folding paper to make these accordion or meandering journals depending upon size paper one is starting with and the size of the finished journal one wishes to end up with.
I learned from watching this YouTube video by Cathy Johnson.
For my post here, I'm using an 8.5 x 11 inch piece of bond paper just as a visual example. In fact I practiced this a couple of times on bond paper before I made one out of watercolor paper.
When I made several mini journals out of watercolor paper, I went all out adding covers as seen in this earlier post.......
Also.......if you want longer accordion folded journals, you can glue two together making sure the folds remain at the join folding in the direction you need it to continue. (Hopefully that made sense)