How do dialects and language vary throughout France? Are there big differences in different regions?

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There are no huge dialects differences, I mean not so huge that you wouldn’t understand anything moving from a region to another in France. Nevertheless, each village has its own... way to talk x) but nowadays, we only speak it within the family I guess... We don’t use it at all to talk to someone we don’t know they’re from the same village or region... But ! Talking of accents, there are major differences indeed. The most known ones are Ch’ti (North) and Provençal (South). It’s obviously way more complicated but I tried to make it as short as possible ^_~