2. Practice All the Time
Instead of purchasing thousands of textbooks that would only bore you, you should start practicing regularly! Start by doing simple tasks, writing small programs, and showing them to someone who can evaluate you.
There are also many training programs for Java beginner programmers to help you out.
Below is a list of the best platforms to practice Java: CodeGym
Having more than 1200 different tasks, CodeGym (https://codegym.cc) should be your first choice. Most of the tasks are aimed to teach you to solve practical issues. CodeGym has an online validator that checks your task outcomes every time and displays your result and improvement suggestions accordingly.