Placement routing plays MAJOR ROLES in pcb design, quality of the board depends on placement and routing, good placement and routing can reduce your board fabrication cost also.

Place components by considering routing strategy and follow schematic flow once your placement is done do fanout for all the components, route high SPEED interfaces and complex AREAS first and maintain GROUND reference plane for all high speed signals and make sure that every trace has reference plane and try to reduce vias on signals vias can change trace characteristic impedance.

Placement routing plays major roles in pcb design, quality of the board depends on placement and routing, good placement and routing can reduce your board fabrication cost also.

Place components by considering routing strategy and follow schematic flow once your placement is done do fanout for all the components, route high speed interfaces and complex areas first and maintain ground reference plane for all high speed signals and make sure that every trace has reference plane and try to reduce vias on signals vias can change trace characteristic impedance.