auvrm papu wrote:If yes, can someone explain how is it is useful for the real world/job?
That depends to a large degree on which job market you're asking about. There are large markets (like North America and Europe) where such certifications count for very little, and where actual experience is much more important than theoretical knowledge.
Tick check! Okay, I guess that was just an itch. Oh wait! Just a tiny ad:
Devious Experiments for a Truly Passive Greenhouse!