Welcome to Tableau
Have you gone through the free on-line training on the tableau community site? it is really very good and the videos are structured by topic
if that is not for you - contact the local TUG group - and see if they have a training leader
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If you brand new and have only looked at the Tableau online tutorials, take the beginner and advanced Tableau 2018 courses by Kirill Eremenko<https://www.udemy.com/user/kirilleremenko/> on Udemy. Next look at Lucas Haim’s Udemy course<https://www.udemy.com/tableau-accelerate-your-career-and-get-certified/>. Each course in about 5-8 hours and you can usually find a coupon so they cost < $20.
The difference in the Tableau tutorials vs a Udemy course is that the Tableau tutorials each cover a very specific topic. A Udemy course will give you a broad overview. Both are needed, but start with the overview.
After that, then think about spending $$$ for personal tutoring!