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We want to make it easy to find and report bugs in any browser, as well as help you find resources while you’re building your site.

Telling browser vendors about issues you find in their browser, on a specific device or platform is an integral part of making the web platform better!

Adding your support to existing bugs helps developers to prioritize which issues are effecting users.
Here you can search through all major browser bug trackers to find a bug you're looking for.
Does it happen in other browsers? Is it a regression? Do you have a reduced test case? The more information you can provide, the better chance your bug can be fixed!
To ensure your bug is fixed promptly, it's important to tell the right people about it. All of the major browser vendors provide a way to report bugs.

Discussing challenges you are facing with other developers is a great way for both learning and share best practices.