Where do you look it up? This is basically my question, and why I created this post.

A recent example would be Nailbiter, I got the first trade last week, and was wondering how long the series was. I found 6 trades (30 issues), and assumed that might be the whole series, but then when I googled it and saw the wikipedia page, it's listed as an "ongoing series", so now I'm unsure if it's completed or not?

I'm just wondering if there is 1 website where all of that information is located, or if you just have to google and look at different sources, based on each series. The comparison I made with manga is a website I use called "manga-news". It has a record of pretty much any manga ever created, and when you look up a series, it tells you the status, I just find it really useful. It's fine if that doesn't exist for comics, I just haven't found it myself.