One new learning / day - however small it is

• Read a blog / or article
• Watch TED talk 
• Read a small self-help book (many free eBooks available with less than 100 pages/can be completed in 1-2 days)
• Explore on how things works - on variety of domains
• Watch documentary on your favorite subjects
• Get to know new healthier life style habits
• Find a ways for digital detox
• Look at the ways to improve your existing good life style habits
• Relook and try to practice your childhood passion that you left long back due to your professional commitments / busy life 
• Subscribe to good YouTube channel
• Watch webinars
• Attend online free courses
• Watch TV on new travel destinations
• Understand/Read new culture around the world
• Learn ancient wisdom