Video: SQL Server auto-tuning and adaptive query plans, from SQLBITS
Free ebooks from RedGate
SQL Server interview questions
One different free e-book every day
Free content to learn Power BI
Hands on Lab for Azure Data Factory
Free training from Kendra Little
Keynote about Cosmo DB - PASS Summit 2017 - 2nd Day
Excelent keynote with very detailed and technical explanations about what is exactly the place of Cosmo DB in the database market
Link: http://www.pass.org/summit/2017/PASStv.aspx?watch=7SRi9vyDtWY
PASSTV : On Demand Sessions from PASS Summit 2017
PASS Summit always offers a few sessions for free. Among several others there are "Responding to Extended events in near real time", one of the best sessions of the event in my opinion and "Dax Best Practices", with a lot of in deep information about DAX.
Link: http://www.pass.org/summit/2017/PASStv.aspx?watch=7SRi9vyDtWY
PASS Summit 2017 Sneak Peaks
These are pre-recorded sessions from PASS Summit. These sessions are always offered before PASS Summit as an example of what we will find on the event.
Link : http://www.pass.org/summit/2017/Sessions/SneakPeeks.aspx