Almost everything you want to know about Imperial Guards: Key Principles, Campaign Advices, Build Orders, Strategies, Tactics, Priorities, Morale, Garrison, Tiers, Hotkeys, Infiltration, Units, Special Weapons, Add-ons, etc; you name it, it's probably here.

F.A.Q

Is this guide new players friendly ?
No, it executes them for failing to defeat the Chaos in combat Yes.

This guide is huge! I just want to know the basics and I don't want to read all that!
That's why I also made "A Short Guide to Imperial Guards", it contains only the basics without going into details.

This guide is huge! how am I going to learn all that ?
Read something you're interested in -> apply. Read something you're interested in -> apply. Repeat.

For more details check out the "F.A.Q" section of the guide.