Everybody's situation is different. I don't recommend you to do something you have no idea. Do some more research before you make a decision. Ideally choose something you like and you could develop further in the future. Think in a long term! Once you are working, you always could update or attend some part time courses according to the needs of your job. Don't waste your time doing something unmeaningful!
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some 4-5 star restaurant will need formal training before the waiter/waitress can take any customers. but average family restaurants... no