I'm working for a website to convert the website url to SEO friendly URL. For this I made plan like -
mysite.com/category-name/pageid-123-page-name
But I looked some similar categorized high ranked websites, they have the same structure, except one thing. Their url looks like -
theirsite.com/category-nae/pageid-123-page-name.html
and another one has
theirsite.com/category-nae/pageid-123-page-name.php
Now I know those text in url help with seo. But in this case is it much helpful to have a file extension? If yes, which one is better?
Or if my plan is ok, will it be better with a / at the end?