how do I create a simple blog in html?

For that you will need to use a server-side script in combination with SQL. Try PHP with SQL using MySQL as your database. What you want to do cannot be done using only HTML.

HTML is a mark-up language used to structure web pages. If you want to perform logic on the web page, then you will need a language capable of doing so i.e. PHP or Javascript. If you want to store data that can be called when a page loads, then you would need to use a database and you would need to use a query language to manipulate that data i.e. SQL.
 
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