What's the Difference Between Positive and Negative Concord?

Negative concord is a common feature in all over the planet to have this sort of um we'll call it negative concord. It has various kinds of rules so in ancient greek any role can show this but weird things happen if your normal boring simple negative particle comes first or if it comes after the other negative words. So that adds just a little dance to this madness. Spanish does Italian do this? Uh I would probably know. And then there's also even more things like if you have the númca or hamas both meaning never you negate the whole sentence. You're not gonna look okay.