If you write code to SQL Server then you might be interested in this: I have written a tSQLt tdd training course which has helped over 500 people learn both tSQLt and how to apply TDD practices to their SQL Server T-SQL development, you can join the course at https://courses.agilesql.club.
It is a constant source of frustration for some people that it is hard to download SSDT or SSDT-BI or you download the wrong thing.
This is an example of some frustration: https://social.msdn.microsoft.com/Forums/sqlserver/en-US/c82354d0-2f88-4…
Anyway, this is now sorted as there is a single page to download SSMS or SSDT:
and SSDT and SSDT-BI:
Feel free to grab Preview or RTM versions!