I have some basic react/js/html/css/gatsby knowlege for 3 month，But I don’t understand how to create a website theme/template like https://strapi.io from scratch. Thank u for advise me some information to learn about.
I hope I understood what you asking for. But strapi doesn’t create the frontend components its a headless CMS so you will need to create the frontend components yourself and use strapi as an API for sending back your data to create your website.
A great video by Marion Ott that shows how to build content types using Strapi is linked below.
Hope this helps 
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