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I’d start with learning SQL. Download the adventure works database and the free version of Microsoft sql server on your computer. I took this super cheap course on Udemy to study some advanced SQL writing.
https://www.udemy.com/course/microsoft-sql-from-a-to-z/learn/lecture/6454508?start=0#content
After SQL, use Python. I’d recommend reading Python Crash Course by Eric Matthes
https://www.amazon.com/Python-Crash-Course-Hands-Project-Based/dp/1593276036
The learning curve for Python is much harder then SQL; however this is what sets you apart from the men and the boys (or the girls and the ladies) in moving and dealing with ugly data (Pandas, matplotlib, ODBC, etc.). After you get this down, start doing some research about how to use Python and SQL together (connecting to a database, writing queries and executing with Python, creating them into data frames, visualizing then for insightful information).
Just to clarify, and I’m sure this may have been covered in your seminar. There are two distinct differences between working in data and then handling big data. You can get really far just using SQL but it all kinda matters how deep you want to train yourself. Piece of advice, learn one programming language/skill at a time, it does not help to juggle multiple languages to achieve writing hello world 50 times.