Comment by Mev-Rael on "How to have custom URL and remove .html extension without Wordpress?"

You have 3 options:

create a directory per each page and name a directory you would like to see it in the URL and put this page's file into it, and name it index.html, for example about.html > buy-products-from-me/index.html
Install and use any CMS.
Today there are many Online website builders available such as Froont, WiX

However, I would recommend to learn basics of Web development and some HTTP preprocessor such as PHP, also CLI, unix, nginx and Git, and you will be able to create own website and even easily deploy it with git. You may host private repositories on GitLab or for a small fee - on GitHub.

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