Question

One of the questions I had came from the webpage about AAVE. It said that "contact language is developed through processes of second language acquisition." I'm wondering what exactly contact language is. I'm thinking it's like the "bridge language" that can connect the two languages. This web page also mention universal grammar playing a big role in processes and I would like some elaboration on "universal grammar" and how this should pertain to us as teachers because I have never heard this term before. I'm wondering what falls into universal grammar and how we can teach it.