Day 3 of 100 -Java: What to learn?

I am planning to take the help of courses to supplement my study:

Udacity courses:

1. Object Oriented Programming - https://classroom.udacity.com/courses/ud283

   • Inheritance
   • Collections
   • Project

2. Java Basics - https://classroom.udacity.com/courses/ud282

   • Variables and Data types
   • Control flow and conditionals
   • Functions
   • Loops