This event has a lot of good video resources. The current/next one will be in Sept 2020 at New Orleans, LA – subject to Microsoft confirmation due to the Covid-19 outbreak. These – event recorded sessions – are also available on pluralsight. Click here for the main website. Click here for some past Session videos.
On technet, theres an excellent of free videos you can access, download which help towards SQL 2008 MCM certification. Click here for the link. If downloading all – expect to save about 15Gb+ for these video files. Below is a directory listing from my download.