There is a very large worldwide community of people who help make all of this possible. Here are a few seminal links.
The Linux Sound people have a truly enormous and enormously valuable set of documentation, email lists, and much more.
LinuxMusicians is an excellent and multifaceted forum.
Libre Music Production is a new site with many excellent articles.
All are thanks to the Spirit by which we were made, by which all is and may become.