Can someone explain what is data wrangling and why it's important? or What is data wrangling, and how

Yo, data wrangling is where the magic (and pain) happens.

Excel is fine for tiny datasets, but Python (Pandas) or R will save you later.

Tools? KNIME is great for no-code wrangling. Also, check out this free ebook: "Data Wrangling with Python."

And trust me, skipping it = bad results. Learned that the hard way.