Apparently, Immersive Audio is the current hot topic for sound engineers. Despite the euphoria, the need for solid basic knowledge is still mandatory for any "new" technology or method. Of course this is also true for immersive audio. Far from being a new production technology, immersive audio has regained high interest mainly through the leap of developments in the area of Virtual Reality. In this workshop, the aforementioned basic knowledge will be presented, from localisation for 2-channel to 5-channel systems and beyond. A special focus will be given to Ambisonics, which has seen an unprecedented success especially in VR. It is hard to imagine a field related to 3D-Audio with more misunderstandings than with Ambisonics. The technology will be explained in sound engineer's terms and systematically put in context to other main solutions like channel-based or object-based production. Comparisons of the different approaches will be made with respect to their preferred use case.