Both right? "I don't know anything." and "I don't know nothing." Thanks!
and, I don't know anyone named Tom, or, I don't know nobody named Tom. ?

Question

Both right? "I don't know anything." and "I don't know nothing." Thanks!
and, I don't know anyone named Tom, or, I don't know nobody named Tom. ?

Answer

"I don't know nothing" contains a double negative, which is a no-no in English grammar.

Answer

"I don't know anything" is correct. 
"I don't know nothing" is not correct because good grammar does not contain double negatives.
However, less educated people in the United States might use double negatives, so you might hear them say something like "I don't know nothing."

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!