How would I go about making drop down menus?

Eg;

+ Main Header
- Sub 1
- Sub 2
- Sub 3

Then when your mouse goes over "Main Header" a menu drops down with "Sub 1, Sub 2 and Sub 3"

Or hover over the headings at the top of the pages, search or quick links.

I searched on google but it either gave me stuff to buy or files that I couldn't open.

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