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Others may disagree but this all part of data engineering, data science, data analytics, data visualization to me. Google those terms, read up, choose some free courses to get started. Often machine learning and “AI” get lumped into this area too.

There’s probably useful free data sets out on the internet. Learning python is useful.

I know AWS has a heap of services catering to data pipe lines.. maybe see if there’s a free tier on anything.

The fixing of bad data I’ve most commonly heard of as “data cleansing” or “data scrubbing”.