Catagory Drop Down Menu

Im Wondering how possible (if at all) if i could make a drop down menu from my page links at the top of my blog, to list the catagories from my blog…

here is my blog to help make things easier…

https://www.rivercitylife.org.au/blog/index.php

Now i am aiming to make a drop down menu, say with javascript, as this has worked before. I would want it dropping down from where it says ‘Home’ at the top of the page…

Anyone have any ideas? I’m not sure about how to go about it exactly…