What is the bitcoin design guide?

Could you elaborate on the Bitcoin design guide? I'm curious to understand its purpose and core principles. I've heard about Bitcoin's decentralized nature and its use of blockchain technology, but I'm interested in how these are reflected in its design. Does the guide cover topics such as mining rewards, transaction verification, and security measures? I'm also interested in knowing if it discusses the scalability of Bitcoin and any proposed solutions to address potential limitations. A comprehensive understanding of the Bitcoin design guide would help me gain a deeper insight into the workings of this pioneering cryptocurrency.