Hello Vagulus
You can start with the "Getting Started" video tutorials on Discovery Spaceclaim. They are available on this forum itself at below link. You can also access them from the Home page of this forum!
https://ansyskm.ansys.com/forums/topic/discovery-spaceclaim-getting-started-tutorials
Next, you can check out the tutorials on topics like advanced design, repair, model preparation, sheet metal, etc at below link:
https://ansyskm.ansys.com/forums/topic/discovery-spaceclaim-tutorials