Re: Circuit designing
This is the pretty common problem for beginners, so do not be frustrated. You need to study the electrical networks theory first. Without learning this subject you cannot do anything in electrical engineering. Then you need to study electronics in order to understand how the circuits are built and work. Of course, you need to have to be familiar with some elements in physics and math before studying these subjects. Then you will be able to work with low frequency and DC circuits and acquire some valuable experience. After these steps you may start to learn RF and microwave engineering, high speed and RF design technologies, EMC and so on. It is very interesting way, but do not expect to do it for a month or a year. Unfortunately there are a lot of people (I know many) who even at retirement age still have no clue how PCB trace is working, what modes are possible in this trace and even how inductor and capacitor are working at high frequencies. So it is up to you how consistently you will acquire and use the knowledge.
Good luck with this exciting studies!