How to understand the logic of electrical circuits?

Question

Electronics

Suppose it is clear that the transistor controls the collector-emitter current using a signal from the base, the diode passes in one direction, the capacitor passes alternating, but not direct current, etc.
There are also series and parallel resistances, the sum of the currents entering and exiting the connection.
And everywhere, at first, a bunch of analysis of each detail is written, and then immediately some kind of scheme. And there everything is so connected that you’ll understand how the current generally understands what to do with all this. So you look - in parallel, so - sequentially. Generally in a circle twisted.
Duck, the current does not change pointwise, but in a section, or in the entire circuit. And this is all in my head. Where is there in parallel in this lattice, where will he go and what does he need .......

Answer 1

As elsewhere in complex systems, you need to be able to think not in separate parts, but in functional blocks, and be able to distinguish them in the diagram.
An example would be nice here, but if the question is not specific, then the answer will be without an example)