This document provides a comprehensive guide to PCB design, covering fundamental design workflows and advanced strategies for AI/high-speed applications. It offers detailed solutions to five core challenges: impedance control, BGA fan-out, power decoupling, thermal management, and DFM/DFA, incorporating practical case studies from TOPFAST. The aim is to help engineers systematically master key technologies from schematic to mass production, ensuring manufacturability and reliability of high-performance designs while accelerating time-to-market.