Poor Design
Another Poor Design

Good Design

Guidelines
Ø Keep wiring conductors short and straight
Ø Do not bend the leads next to a component. This will cause a weak spot and may cause the lead to fall off
Ø Avoid crossing conductors and component leads if possible
Ø Wire the input power to the connection channels on the outer edges of the breadboard (some of the examples shown did not do this)
Ø Do not try to insert more than one lead into one connection point.