Welcome aboard. Not ignorant questions at all and many in here are happy to share.
We have to lay a wash cloth on the edge of our tub to keep water from running out and off of the edge of the tub. Watch it closely next time someone showers and see if it's splash or running off the edge vs an actual plumbing leak that runs from under the tub/shower base. The curtain may not be able to close far enough to stop this. Ours has some little suction cups on the curtain but they dont work.
It's unlikely to run up past the end as it should have a flange. May be leaking at the drain connection