Definition
Refers to having some experience or knowledge about certain matters, facts, or information.
些许事情，一点点知识
Don't worry, I know a thing or two about this kind of situation, I know how to handle it.
别担心，我对这种情况略知一二，我知道如何处理。
Although she looks young, she knows a thing or two about investing.
虽然她看起来年轻，但她对投资略知一二。
I'm not an expert, but I know a thing or two about cooking.
我不是专家，但我对烹饪略知一二。