Here 4 basic button connections are documented in breadboard diagrams, so easy to duplicate. The connections come from RS tutorial video, where they are explained in more detail and shown working.
Arduino Video Tutorial - 01 Get to know your Tools with Massimo Banzi (starting at ~4:40)
The Button: 
Buttons, LEDs, jumper cables are available online at Amazon or in person at EPO Houston.
Button Circuit Connections
- Top/bottom have 2 wire connectors
- place on different lines on breadboard
- Left/right have no connectors
- line up with breadboard line.
- Push button to close circuit from left side to right side of button
Breadboard Wiring Diagrams (for tutorial examples)
- Push button to light LED directly
- Push button with wire to connect button to the LED
- Two push buttons in series, so both buttons must be pushed to light LED
- Two push buttons in parallel, so if either button (or both) are pushed the LED will light.
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