Are you looking for ISTQB training material? A while ago I have put together training material for the older version of the ISTQB foundation exam. Even though there’s a new updated version, I think it still valuable to have this knowledge for you who are maybe just getting into testing.
Sharing all the slideshows I have used in my ISTQB training.
You can access each one of them here.
Take a look at my book as well
The Testers Book: An Unconventional Way to Software Testing by Rogerio da Silva