就 means "just" or "at once"

It has many meanings. It can mean "just" or "then". It is also used in 就是 for emphasis. It would be better to see examples of sentences you don't understand it being used in and then we can explain it better.

谢谢. -Kassia

就像我回答的这样，就可以，就能够，maybe sometimes it menas for example, sometimes it menas then