I am literally confused what is meant by Core Java?

• is it JLS?
• is it JVM/JVMs?
• is it OOPs?
• is it understand Collection?

I have become familiar with java. IDK exactly at which phase I am doing. I can do OOPs easily ( have also understood F-form polymorphism) I can easily use stream , collection, iterator API . I can also integrate to them in my project. I started delving into deep JLS, JVMs but after seeing them I am confused are they core java because seeing those topics I felt like I did only basics of java.

Hello everyone, I started learning Java Full Stack about 6 months ago, but somehow I couldn't complete it. Now that I have started again, I realize that I have forgotten most of the concepts. This time, I have started from scratch and am currently learning OOP concepts. I hope I will be able to complete it successfully this time.

If you're in the same boat, we can connect and help each other stay consistent and learn together.

I also know the MERN stack, through which I completed an internship and some freelance work. Alongside that, I am practicing DSA as well.

Till now I have completed 200 lc question and in backend I have learnt jdbc, hibernate, Meaven,junit 5, and spring & spring boot basic. I'm going to start spring mvc from next week.

What should I do after doing backend

1) should I go for the frontend I have started this once but I give up

2) devops but I heard that they usually don't hire fresher

3)ai/ml to integrate my project with ai .

You can share your experience according to you which is best field for a fresher. Is their any thing that I should do apart from this .

I apologise for asking this in this sub Reddit, but how exactly have the programmes in this sub Reddit learn java, I am now forced to learn java(because of school) and kind of enjoy it but can really fully comprehend it, I’ve tried a whole bunch of Udemy courses yet nothing worked out, any help would be greatly greatly greatly appreciated, sorry again