+1 for building and measuring whatever combination interests you in blocks or pieces at a time - try different test points and different value components until it becomes clear what is causing what.
When you run into something that needs explanation, if the Internet in general doesn't help, try searching YouTube - it's a pretty amazing resource; a picture is worth a thousand words and video is worth about 24-30 pictures (frames) per second
If that doesn't clear things up and you can post a very specific question (and maybe include some images or schematics of the circuit in question) there are probably lots of people here who can help sort it out.
Sometimes it just takes time.