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There is so much technique and knowledge a good baker has it can’t all be taken in over just one day. I’d suggest a good baker/trainer will be able to convey things of interest to both novices and experienced home bakers.
I have been on a bread course and also spent a day with a local chef and learned loads both times. On both of these days a friend who had been baking for years also came along and he gained a lot of useful insight.
That's a good idea. He does like baking bread, and there's a technical enough element for him to geek out on.
The trouble I'm having with all of them (price aside) is not wanting anything too basic where they won't really learn anything.