Microfluidics involves the control and manipulation of fluids on a small scale, leading to unique phenomena and the development of functional components and machines. This chapter focuses on the fundamental physics of microfluidics and the standard methods used to fabricate microfluidic devices. It explores the distinctive behavior of fluids at the microscale, including low Reynolds numbers, dominant diffusion effects, and amplified surface tension forces. Understanding these phenomena is essential for designing effective microfluidic devices. The chapter also discusses various fabrication methods such as micromachining, soft lithography, molding, 3D printing, and paper-based techniques, highlighting their advantages and disadvantages. These fabrication methods play a crucial role in realizing the potential of microfluidic devices in the life sciences. By combining the understanding of microscale physics with appropriate fabrication techniques, researchers can create innovative microfluidic devices for applications in diagnostics, drug delivery, tissue engineering, and molecular analysis. This chapter serves as a comprehensive introduction to the physics of microfluidics and the fabrication methods involved, laying the groundwork for further advancements in this exciting field.