ELI5 Weddings - Where do wedding traditions (eg not seeing the bride in her dress) come from?

Why is there the tradition of not seeing the bride in the wedding dress beforehand? Where did something old, something new, something borrowed and something blue come from? Why is there a tradition of smashing a glass at the end of Jewish weddings? What happens if someone 'objects' during the ceremony?

... We explain like i'm five!

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