My favorite Bhagavad Gita lessons from Mahabharat

Mahabharat is literally epic. If you take a close look at the old myths, add or remove a little bit here and there, you'll get a blockbuster movie/series guaranteed :). They tell us that everything existed since eternity.

But they teach a few things that are very practical.

There's two things that are worth paying attention to that Krishna tells Arjuna in the battlefield. Extremely difficult to implement, but if anyone can manage that, he/she will be happy! Krishna is the best adviser anyone can get! - btw he was a player ;) We all have a part of that!

Yogastha kuru karmaani
Meaning: Establish union between body and mind. Take action.

Karmanyeva Adhikaraste Maa Phaleshu Kadaachana
Meaning : You are entitled only to your action, not to the fruits of your action

These are easy to understand  yet so difficult to follow. He says, first create calm in your mind, let the body be in sync with the mind. Then initiate the action you have to do. In other words, there's a chance you'll screw up the things you do if you're not calm.

Once you take action, your job is done. You can't expect to get the result you want all the time. It's just not in your control. He tells Arjuna, you can shoot the arrow at the target. What you control is your stillness and aim when you shoot the arrow, but the target can choose to move after you shoot. In that case, you won't hit the target but there's nothing you can do about it. This is where we get stuck all the time right (myself included).. :) Which also means, you can't judge yourself or others based on the result as long as you did it sincerely.

People developed meditation techniques to help us with that. Believe it or not, even martial arts like Kung-Fu is a type of exercise that allows you to integrate the body and the mind.
This helps us with the "yogastha" part. Once we can do that, taking action is our responsibility, and we do that pretty well. If we are able to establish the calm, we won't get dissatisfied when the result doesn't go in our favor. After-all, the basic nature of human is joy.