Witch are the packages should i learn in the begining

Question

Java

Answer 1

All Core java concepts.. (data types, i/O, loops, data structures, mainly object oriented concepts...)
In this app, mostly it covers all basics.. For beginner, it helps what shloud learn by them... So complete the course..

Next
Mostly from
Java.util, java.lang, java.io
java.swing, java.javaFX
Mainly learn about Collections (from util), input/output(i/o), date API,.. Gui,...
Dont look at packages.. Look at concepts.. I think it has 5 main packages which covers almost all java. So that's why it's hard to a learn a package full..

EE :=> sevlets, ejb, RMI, Security...........
Edit :
In this java learning path link, see *New to Java* at side for topics to learn for new ones..
https://docs.oracle.com/javase/tutorial/tutorialLearningPaths.html

Answer 2

https://www.sololearn.com/discuss/2432110/?ref=app

Answer 3

this is still too wide range because there are many classes in each package that you don't need to know

Module java.base
java.io (java.nio..)
java.lang
(java.lang.reflect)
java.time
java.util
java.util.function
java.util.regex
(java.util.stream)