The Breadboard is used to connect electronics component, it is preferred where changes are required before finalizing the circuit or we can say it is used for testing the circuits. Attaching Components to Breadboard doesn’t Require Soldering, we can attach components to Breadboard just by simply putting them in holes.
As you can see in the above image, the holes on which Green line passes are connected to each other. Usually we use horizontally connected lines to give 5 V and Ground Supply, Vertically Connected lines for prototyping (Testing various Circuits).
You can see in above Image Parallel Connection, One thing you need to keep in mind is that one end should be connected to other end.