Java Online Tutorials is easy to learn.
Java is very easy to learn with gkindex.com interactive Java Online Compiler makes very easy to practice the programs without worry of installing.
Python Tutorial is very good. See it for yourself...
Python tutorials divided into two sections. One section is with basics of python and other section is with advanced concepts of python.
Apache Kafka Tutorials.
Apache Kafka is a framework which helps to process the real time data with publish and subscriber concept.Capable of handling millions of events..