How to make a drawer type thing in a webpage

Hello everyone my name is BrownCoat, I am a newbie in this platform and I am asking my first question...

Here is the image I can't describe it so take a look at the image...

So in the image you can see that this site has a drawer-ish thing and contains a lot of links to other pages of the same site so can you all tell me how am I supposed to do this in code?? And how can I modify its properties like the placement in top, bottom, left or right??