However, many candidates search for free PDF versions because the books are relatively expensive (around $40 each) or unavailable in their region. While I understand the financial constraints, I strongly encourage supporting the author. That said, I will provide you with to master system design interviews — without stealing copyrighted material.
Alex Xu regularly publishes of book chapters on his website https://blog.bytebytego.com/ . You can learn 80% of the concepts without buying the book.
