Dedicated URL for page how to?

How do I make a dedicated URL for a particular page?

For example at https://mysite.com/page

I created an HTML page and the URL for it is https://mysite.com/index.php?page/ how do I get rid of index.php?

I guess I could put a redirect rule in .htaccess but I want it to display cleanly in the address bar.

Thanks you.