I guess, you might have received the contact details of your trainer? He might forward them to you. I don't think the "Live Training" videos are available on the website. I may be wrong, but I would that.
I watched the recorded video(s) of the "Live Online Training" here....
I want to practice making different kind of viz but I don't know where to get the other sample data sets. I only have the Superstore data set.
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You are looking for additional data sets to experiment with, correct? My personal favorite set of sample data is from Tableau's corporate Headquarter's home city: Seattle | Open Data You can form OData connections to a lot of public data and test making various views. There may be some similar data sets in your area. I find it easer to learn Tableau using data that means something to me.
Hope this helps!
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if you want to play around with some other data (that is not from the training videos) I recommend Microsofts SQL Server Sample "AdventureWorks". It's a huge database of a fictional bike company.