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Perfect for beginners and a great refresher for hackers like me who haven't worked at this level for a while. What I love about this document is how it relays the mathematical concepts in a solid, grounded way that yet still does not talk down to the reader.

I'm just starting, still at the binary, but lo and behold, I calculated that 11011011 is 219, and that 1010110101 is 693! What was a bunch of meaningless ones and zeros to me at first now can be translated into a number I can understand. I know it's a very small thing, but to see the number I came up with coincide with an online converter was just a great feeling and a small victory for me. And that's the very beginning of the document, I can't wait to read on and squeeze every bit of knowledge I can. I'm so happy and excited about this, it's just so great to learn new things. Thank you, Neil! And thanks to the website for putting together a guide on how to started with lots of info, I'm very grateful.

Whoever wrote this should consider going into teaching if they don't teach quite a bit already.

I'm a mid level tech when it comes to networking so I understand binary super well but have always been a bit afraid of hex (hex isn't completely implemented on the internet yet) but this guy/gal/idc is a wonderful teacher that even made me realize things about binary I didn't understand.

Good stuff A+

Loved how it was to the point and all. I feel like I'm getting somewhere. Progress!