Depends on what you plan on doing with Kotlin. If you are heading towards Android development, learn Java first as most examples are in Java and the Java course is complete here and elsewhere.
If you don't plan on Android, you should have one language understood before learning Kotlin as the courses are not the greatest so that language helps you understand things better. But, it doesn't need to be Java.
KrOW I haven't found any as yet. The best so far is:
But, as a first language most would be lost. Too, much thrown at you, not enough explaination.
I dont know well kotlin but i know for sure that any language is indipendent from another one. Sure, some language can inherit syntax, keywords etc from another, but you can learn it without learn other one... At end: you can learn Kotlin without know java
John Wells I searched and effectively seem that every resource assume previous programming knowldgments (almost ever java)... Some paid books describe they self "good for absolute beginner" but i dont know how much is true..... Really strange 😕😕😕