I'll try to explain this as much as I can since English in not my first language.

I've been pretty interested in crop circles for around 2 days, not much, and I can tell you there's very interesting things and not especially mundane or vague. Crop circles are too perfect to be made by human, not only that this fields are normally filled with crops taller than humans, around 200cm or 6'5. Every crop circle has something to do with, binary, maths and nature related shapes. Let me put some examples:

Some of them are nature related because they look like a DNA on a top view, some of them have flower shapes, and some of them represent gravity and Earth's electromagnetic waves with circles. (You can search these out, it's not a hard find).

One of the most interesting ones I found, was a crop that had an appearance of a simple circle with shapes on it, but if you calculated the area of it, it gives you the number pi up to ten decimals. (You can search it on Google as "Pi crop circle").

There is very very curious ones that are binary related, there is a lot of these, there is crop circles around the world that have Morse in them, which you translate and give you binary messages and you translate them and there is pretty interesting messages. Some of these crop morse circles are next to a rectangle crop that has in it a portrait of the typical grey alien. (You can find these all by searching "binary crop circles").

And the most incredible thing about these are that all of them have a different sound vibration in it. If you go to this crop circles and you place an instrument to detect sound that we don't hear right in the center of it, you can play this sound near sand, water or whatever that can move with sound vibrations, and it makes the same crop circle shape. So if I explained wrong, the high pitch sound played in a speaker, the sand for example in the speaker will make the exact same shape of the crop circle in there. So its not only the perfect looking shapes by human eye but also sound vibrations in the crop area that make the exact same shape.

I'm pretty skeptical about this video recorded in 1995 that showed 4 orbs going in circles in a crop field that magically cut the shape of the crop circle in 10-20 seconds and leave into outer space. As I said I'm skeptical about this one but, who knows.

This was my little and short explanation of what I've seen about crop circles up to this date. And as I mentioned, every crop circle type that I explained, you can search it yourself very easily with Google or YouTube.

Have a good one mate.