There is a saying that PCB design is 90% placement and 10% routing. While you could argue about the percentage of each, it is generally accepted that good component placement is critical for good board design. Keep in mind that you may need to tune the placement as you route too.
The video demonstrates various methods of selecting components for placement and illustrates how the ratsnest helps with optimising your placement.
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Attachments:
 | 7-PositioningComponentsonthePCB.pdf |