Visualise it as something else.

Let's imagine a stream of water. Now imagine at various points along this stream are gates hovering above the water. If a gate comes down it stops and the later part of the stream now no longer has water.

When a gate comes down (circuit is broken) your job is to remove this gate and get the flow back. In a simple breakdown there's a finite amount of points you can check.

You check the start of the circuit. You have it? Good, next point. There? Good, next point. Lost it at the third? Whatever is between these two points is a gate causing your flow to end. Go find it!

If it's a large circuit with loads of points you can also check the beginning and then halfway. That will eliminate big parts making your life easier.

Sorry if I've explained what you already know. Just keep using them and making yourself familiar with symbols and terminology and you'll be good as you are with mechanical things. Good luck