Since providing direct links to download copyrighted material (like a paid PDF of a specific author's course) is against copyright policies, I cannot give you a direct "Free Download" link.
Strategic Thinking: Introducing concepts like pawn structures, outposts, and open files. The Risks of "Free PDF" Downloads chess course by praful zaveri pdf free download
Mastermind Chess I: A related title by Zaveri accessible on Scribd. Basic Concepts : The book covers fundamental chess