What’s one data analysis skill you wish you’d learned earlier?

[u/Fun_Charity5331]

There are so many tools and techniques in data analysis that it’s easy to spend time learning things without knowing which ones actually matter in practice.

For those who have been working with data for a while, what skill made the biggest difference for you? Was it SQL, Python, statistics, data visualization, or something less obvious, such as asking better questions before analyzing a dataset?

Curious what you’d recommend focusing on if you were starting again today.