Im currently studying electronics and try to make a school project using hobby kit book but I dont understand how the circuit function except for what it does.. can anyone point me to a good website explaining how circuit work.. example. LED flashing light or knight rider light. Tq. It help me a lot if i understand how the circuit function because i need to present it to my lecturer.

Hi, I was wondering what the "theory of operation" for an electrical circuit is. In other words I mean how does a circuit work, like what you need and stuff.

MY Circuit is: lamp , relay ,(IC:op-amp LM385) and push bottom and wanted to make lamp lights(ON) after i push the push bottom and after 5secnod the lamp off automatically the circuit simillar to the effect of the timer (IC 555 ) circuit
i install my project on breadboard (nonsoldered board) but it is not work
how can i troubleshooting the problem in this circuit?
help me by giving me methods of tests or wesites of troubleshooting or learn video to install it again from begin or a pdf book to install the circuit from the start step by step
please help me quickly i need the circuit work in agood condition
thaxn
plz explain in details
im not profesional