The schematic describes connections
A schematic records which component pins belong on each electrical net. Label supplies and important signals clearly. Check the component’s pin names and values before thinking about the board’s appearance.
A footprint is a physical commitment
The symbol and footprint must agree on pin numbering and the actual package. A schematic can be electrically sensible while its footprint is wrong. Check dimensions, orientation and connector access against the component documentation.
Placement shapes routing
Place parts with their electrical relationships and mechanical constraints in mind. Think about power paths, return paths and access for connectors. Routing is easier to review when placement has a clear reason.
Checks support review; they do not replace it
ERC and DRC can highlight configured-rule violations. They cannot guarantee that your selected component, circuit or manufacturing assumptions are correct. Review the schematic, layout and fabrication preview before producing Gerber files and a BOM.
Learn the full flow
Hexa Firmware Labs teaches this flow in EasyEDA, with an ESP32 development-board design capstone. Confirm fabrication and assembly arrangements separately before ordering boards.