Wrong dataset for dashboard in Tableau
Appears there's a wrong dataset for Section 12 (Dashboard in Tableau) provided in Resources section for lesson 2. The data is different and the problem arises when trying to incorporate Date filter, as there's no date field in dataset. As a workaround, it's possible to create a calculated field from month and year (MAKEDATE(year, month, 01)), but it's still hard to compare your own charts to presenter's, since the data is a bit different as well.
thanks for reaching out! I'll make sure the correct resource is uploaded. In the meantime, you can use the dataset from this lecture which contains the date column:
The Complete Data Visualization Course with Python, R, Tableau, and Excel | 365 Data Science
Hope this helps!