I am finding hard to understand Java please will someone tell me the key point to look for when coding Java

Answer 1

There are many concepts you need to know as a professional in general, not only for Java programming. But Java is a object oriented language so it's essential to understand the oop concept.
As you just started the Java course I'd recommend to finish the course and to reach out to the community on the q&a whenever you have specific questions.
What are you struggling with? A particular lesson maybe?