If you’re on training HTML, you can create your files like this structure:
Your_project
|
|_index.html <-- /index.html
|_index_folder
|
|_contact.html <-- /index/contact.html
|_privacy.html <-- /index/privacy.html
Note: It’s just for learning, when you work with server, it may be different.
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solved How do I custom make a url in html?