I started online course for beginners in Photoshop.
This is a perfect example of how you can utilize your free time to learn and once you know, spread the knowledge so that others also learn and you also now more about it and can earn as well. Never to let it go waste as this all kills learnt now will be helpful for rest of your life.
its a lot.. Like my parents used to say when i was a kid ''you will learn until you die''.