What are the affects of different types of sugars?

So i know of the different types of sugars e.g. fructose in fruit, sucrose, (table sugar) dextrose etc, but what do the different types of sugar actually do? Am I right in thinking that fructose should be avoided as it turns straight into fat instead of being used as energy? I'm pretty dumb on this subject so if someone could educate me I'd be very grateful

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