This is more cool than Gremlin itself (which is cool a lot), because with that, I can understand something.
Gremlin seems a simple language when we look at first time, but when the things are mixed together, becomes too much complicated for a beginner that comes from SQL. The concept is simple, but in practice, is not.
Thank you a lot Kelvin, this helped me too much. After that, I can understand better the official documentation. I'm was going crazy due to not find some material like that and thinking of giving up, I spent a month trying to understand this language and I can't. you saved my life.
What a useful material, I hope you write more.
Greetings.