Training allows you to specialise your units in one of the various available [URL=/help/unit]professions[/URL]. The specialisation allows above all to improve the skills of your units, but also to allow them automatic actions according to the profession that has been assigned to them. Each profession defines a set of pre-requisites, in particular the buildings in which the unit can be trained, the necessary equipment and also the career path: a unit must sometimes go through different intermediate professions before accessing more advanced trades.