How to send sound through Bluetooth on Linux

Bluetooth headsets and speakers are now more popular than ever before, but getting them to work under Linux isn’t always very clear. With all that is going on in the Linux sound systems world, it is easy to get lost and even give up. Most of the time, the problem with these devices is that your system can see them, but for some reason it can’t establish a connection. Here is a quick and simple guide on how to get through this problem.