Hard to pick just one, but I would say ownership. It's an essential skill whether you're independent or working for a company.

Team management.

Adaptability.

Communicating my thought well

Be prepared for any situation

Learning to write well.

Responsibility.

Mastering data analytics. In the world of marketing automation, data is king. Understanding what the numbers are telling you, how to optimize campaigns, and making data-driven decisions has been a game changer.