Hi i think am understanding how this electronics works

Hi,I think am understanding this electronics that is all about controlling and shaping of signal such as frequency,amplitude and others and that the basic components of doing this are capacitors and inductors also transistors for switching.Now my question is,HOW DO I CONTROL OR SHAPE THIS SIGNAL with these electronics components in other to build a circuit.PLSSSS CALL MY ATTENTION IF AM WRONG WITH THIS MY UNDERSTANDING AND THINKING.

THANKS A LOT

Why crosspost the same message twice?

Hm, would'nt that be 4x?