Hello, I’m Avinto, and in this section, we’ll be exploring Physical Quantities, which are the fundamental building blocks of physics. We’ll start by distinguishing between fundamental and derived physical quantities, as understanding these basic concepts is key to mastering the subject. We’ll then delve into the powerful tool of dimensional analysis, exploring how it helps us check the correctness of formulas, derive relationships between quantities, and understand their units. Finally, we’ll discuss the limitations of dimensional analysis, which can’t always be relied upon in every situation.