Think about your plan what you actually want to execute and your goal
You can learn so many skills with this .you can join so many courses online like for business ,marketing ,you can also learn about the current scenario. There are plenty of resources to use ,but it automatically depends on you how you really want to invest your crucial time.
As same as you can watch documentaries to increase the knowledge about our past what kind of Operations had been done by our government , what kind of riots took place till now and can think about the reason behind it ( your perception)
You can invest this time to learn so activity or use time ti increase in your mathematical calculation .
If you love reading you can utilize your time for the novels ,books read whatever you can .Its only about the knowledge you are gathering !