How to download a map for Minecraft using mac?

I never knew how to do this so I looked it up and used the Library--> Application Support--> Minecraft but it worked only once… I was hoping there was another way (explained clearly…) I'm just frustrated and I want answers… Thanks.

If you can't find it, go to settings, and click the "open resource packs folder" button. Go to the.minecraft folder from there, and you will see a "saves" folder. Just drag your maps in there.