Did you ever start something (a project, a job, a relationship, etc) that just kicked you in the butt? If at the end of the butt-kicking, you brushed yourself off and tried again (and again and again) until you completed the project, job, relationship, then you displayed grit.
Grit, psychologically-speaking, is having passion for long term goals and showing perseverance to see them reach completion. The classic example of grit is Thomas Edison, who famously said, “I have not failed. I’ve just found 10,000 ways that won’t work.”
The thing about grit is that it is the great equalizer. Often times, it is not the smartest person or the most athletic person that “wins” It is the one who works the hardest/smartest; the one with the most grit!
I don’t know if grit can be taught, but I think the key is having passion. If there is a particular job, skill, or project that you would move heaven and earth to master or complete, then nothing could or would stand in your way. However, if you are doing something that you are not passionate about, it might be better to cut and run, rather than persist in futility (think of digging a deeper and deeper hole).
Having grit can be the difference between a good life and a great life. Find out what you are passionate about and apply every ounce of your energy and resources to see it through to the end!