system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Where/How did Alfred receive butler training?

We know that before Alfred became the Wayne's butler, he used to be an actor, a military medic, and/or a member of either the SAS or the MI6, depending on the continuity. However, non of these jobs provides the skills necessary to run a large household or attend someone as a personal servant. Granted, his father used to buttle for the Waynes as well, but he didn't seem to pass on any knowledge to Alfred before his death, as Alfred at that time steadfastly refused to follow his father's steps. Hence, one has to wonder about how did he not only become a butler, but also an outstandingly capable one.
gpt
Butler training only really takes a few weeks. Military types tend to be quite good at it since they have experience making sure everything is smart and clean, don't have a problem with authority (even in cases where the person in charge is a fool) and are able to deal with the long hours without difficulty.