If I don't have the fundamental or knowledge about Java. Can I start to learn Kotlin directly?

Do you know any Java?

Few years I never touch about Java. Most of the fundamental knowledge already forgot.

You can learn Kotlin without knowing any Java, but knowing Java will help because Kotlin leans on the Java ecosystem for libraries and so forth.

And the standard library is heavily based on Java too.

Which mean I still need to learn Java to understand those libraries?

Not necessarily. You don't need to know java or those libraries. It would just be helpful. You can learn kotlin by itself

Right, you’ll just run into challenges looking at Java sample code in docs and so forth. But I wouldn’t expect it to be that difficult, because Kotlin and Java do have a lot of syntactic similarities, and there’s a tool in IDEA what will convert Java code to Kotlin.

Thanks all.