Hardware development needs to have a certain basic knowledge of electronics, understand the circuit principle, electronic components, welding and other related knowledge. You can start with simple electronic production projects, such as the production of LED lights, transistor switches, etc., and gradually improve your skills.
It is recommended to purchase an entry-level hardware development kit, such as Arduino, Raspberry PI, etc., and learn basic hardware development skills through online tutorials and books, such as circuit design, programming, etc., to gradually master the hardware development process and methods.
Learn mode electricity, and then start welding basic circuit, learn schematic diagram, PCB drawing, proofing back to their own welding test, nothing more to see the design of other people's products, learn to analyze, learn from.