Now lets look at a few different ways that we can hook a light bulb up to a battery. Keep in mind that all 3 of the pictures below are the same way of realizing the previous schematic, and all 3 are valid and correct.

Example 1, light bulb with 2 wires.

Example 2, light bulb touching top of battery with a wire connecting to the bottom of the battery.

Example 3, light bulb pressed against the battery without any wires.

In all of these cases the light bulb is lit up. All 3 examples above are valid representations of what the schematic is telling you to do. It doesn't matter if you use wires or make parts touch by simply pressing one part against another. The point is that you are making electrical contact between all parts that need to be connected.

So when it gets down to it, that's all that a schematic is really telling you. It is telling you to make electrical contact between parts. It doesn't tell you how to make that contact, just that you need to make it. It is up to you to decide the best way to make that contact depending on your project.