iPad 9th gen using 15.5 will not connect to the internet
My iPad suddenly stopped connecting to the internet through my computer
You are attempting to connect to the internet via your computer - and not by using a your iPad’s WiFi connection?
Ideally, your iPad will use a WiFi connection to join your WiFi network - and from there will obtain access to your internet connection via the WiFi Router.
If you are attempting something else, you’ll need to provide specific details of what, precisely, you are attempting to achieve - and how.