I need to update my iPad

https://support.apple.com/guide/ipad/update-ipados-ipad9a74c576/ipados

What iPad kind/model you own and what current iOS version is it running?

What is the “A” model number of your iPad?

The “A” model number of your iPad can be found on the lower area of the aluminium back of your iPad in small print letters right underneath the large, bold printed” iPad”.

which iPad