To the folks I've seen in this thread despairing about how this seems really, really hard at first brush: it is. This is not really a page of intro level electronics concepts. Doesn't mention a whole lot about voltage, current, time vs frequency response, or how to get a grasp on any of those concepts.

If you want a gentler intro that walks you through some of the foundational concepts, Analog Devices has some great free courses on Circuit Theory:

https://wiki.analog.com/university/courses/circuits#circuits...

And another great one on electronics:

https://wiki.analog.com/university/courses/electronics/text/...

They are the best in the business at analog circuit design and A/D conversion. Worthy of your attention if you're serious about learning this stuff.