Draw and check the schematic before assigning footprints and routing the board. Confirm component pin mappings against datasheets, then load the intended manufacturer's rules and inspect generated fabrication files. Use the 3D view to catch obvious mechanical conflicts, but verify dimensions and clearances against the actual enclosure and components.
This is best suited to electronics designers creating printed circuit boards. Before committing a larger project, account for these trade-offs: pCB design requires engineering knowledge; libraries and fabrication rules need verification.