Most of the time, RSS will work. Sometimes, it doesn't. This page provides some quick guidelines on troubleshooting your RSS reading experience. It will also provide a framework for you to find what you need to improve your reading experience even if you aren't having any explicit problems.
First, take advantage of advanced search operators in Google. If you type site:mozilla.org followed by "getting started" or "tutorial," you will find places in that domain that provide guidance on how to do what you need to do in Firefox, for example. Another trick is to use inurl:faq, which will only return pages that contain the characters "faq" in the URL itself. Click on one of the sample searches below to see how it works for yourself.
Second, YouTube is an excellent resource for videos about anything RSS. To troubleshoot or learn more about features in your program, typing the name of the software into the YouTube search box followed by the word "tutorial" (or what you need it to do) generally works. Here are a few examples: