Depends on the trade, you can't make electrical work without some form of recognition I believe. And beyond that I mostly asked regarding customers, you want something to back your claims and prices.
Those are called “trade schools” in the US, and most community colleges have programs for trades. For example, a lot of community colleges have programs in auto repair and heating/cooling.
It gets more complicated in the US because of unions. In many places, you can’t become a plumber or electrician without an apprenticeship, which is controlled by the trade unions. Therefore, community colleges might offer classes on plumbing or electrical, but there’s no equivalent to a certification program, because it’s not possible to become a professional just by going to school.
