Whenever I was an intern in several organizations, the people who got promoted the fastest and rose up the ranks in the best ways had the ability to own and deliver tasks end-to-end.

What does this mean?

—> This shows that you're able to think three steps forward and also enhances your effectiveness when doing the task assigned to you because you know exactly to what level of detail task #1, #2 and #3 need to get done so you can achieve the macro-task or goal which the other person wants to achieve for the organization.

Resources:

https://www.youtube.com/watch?v=75fyGOBy38c

https://www.youtube.com/watch?v=ym0GCmRyDlA