Is there a webpage that shows the night sky but can filter out dim stars? This webpage is very good for viewing the night sky and learning the names of the stars
Timeanddate - Astronomy
However, it shows too many stars. Because I live in the city, I can only see about 50 stars. If I could filter out all of the dim stars, that would help me focus on just the top 50 brightest stars. If I want to learn the names of the stars and how to identify them I have to start with the brightest. Yes, you can scroll over the star and it will tell you how bright it is, but that is very time-consuming.
I think your requirements can be met by Stellarium. It is a freely available open-source planetarium software available for PC, and can be used offline.
There is also a web version, which you can try out here.
You can filter stars out by pollution levels, as illustrated in the stellarium wiki.
Here is an Astronomy Stackexchange answer on matching the magnitude of stars to what is visible from specific cities.