Skilled migration: What technology is the simplest, most common and most popular?

The most sought-after technology is the lead of some partial doors, and the stronger the irreplaceability, the more sought-after it is. Such as dentists, veterinarians, chefs, martial arts coaches and so on. Generally, engineers and architects are generally regarded as skilled occupations, so it is not easy to immigrate, because international students just grab a lot and don't need to find immigrants at all.