The best place for free support is the Web.
Wiki.3cx.com is where you will find almost all of the support that you need. Wiki.3cx.com/documentation has the documentation and FAQ available, and the forums at www.3cx.com/forums are a great place with thousands of posts from all over the world. The search tool in the forums is your friend. Still if you can't find the help you need, post a question. You can usually get a response from someone within a couple of hours.
Blogs we find helpful:
Classroom 3CX training is also available for those who like a more structured class environment with live instructors and practice equipment at http:/...