Really old AC guide (Web archive link, since the original site is down. I found some of the pics in Who's who in AC from the same page as well):
http://web.archive.org/web/2006061305524...y1/ac.html

Pretty much covers the basics. Some ideas and tactics might be outdated by NX, NB, and LR standards but the basics still hold true such as the vs. human section, though it may be a bit more of general guidelines rather than an in-depth how-to guide.

EDIT: I should mention that the focus of the guide is AC3-SL era game mechanics.

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"There is no teacher greater than experience" -Dr. Q Huaong

Dammit, KK already has an AC Encyclopedia.

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"Let's fight... like gentlemen." - Dudley, SF3

Wala ba kayong balak gumawa ng RR encycloopeduia?

Meron, madali magsimula eh. Problema nauubusan ng interest tapusin.

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"Let's fight... like gentlemen." - Dudley, SF3

Its Dated but this stuff is Golden when it comes to the basics, wow RR is the best Armored Core Sites i've seen so far