You need to create a new page using runnning hexo new page "about" . A folder will be created in source/ . There is a file in this folder called index.md . In this file you can write the contents of this page /about in the markdown method.
This page will appear as a layout. post page , if you want a different layout and style, define in the foreground a layout with layout: YOUR_LAYOUT . Of course, you must create this layout in the layout folder in the theme folder. The layout name will be the file name.
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