Where I can find simple tasks to practice my knowledge in Java

Answer 1

You can find them here, in the Sololearn app. It includes the Java course. There is a task after each lesson block.
You can also try challenges. These are simple quizzes. They can test your knowledge of Java and any other programming language.

Answer 2

Check the Code Coach section on the Community tab.
Also there are numerous websites online which offer coding challenges for all sorts of levels. Just a few:
https://leetcode.com/
https://projecteuler.net/
https://www.codewars.com/
https://www.codechef.com/
https://adventofcode.com/

Answer 3

Thank you 😁😁