Loved the point about grit the most. From personal experience, I can vouch that grit is the single largest difference between a mediocre life and a great (or even a good) one. For the longest time, I lacked grit and kept jumping (unhappily) from one thing to another. In the meantime, my friend who stuck to what he wanted to achieve got better at it and built the life many of us dream of living. I hope to learn from him and not repeat the same mistake in 2020 and beyond.