Garrison

TIP: When looking at your own defences.. to avoid this mess (red circles showing your garrison attack range)..

Press “move” instead of “garrison” ..

And it will show you that single buildings attack range..

Don't put ANYTHING in your keep garrison EXCEPT ARCHERS. Cannot stress that enough. Only archers can shoot outside the keep walls, and if you put melee troops in the keep, they'll just be killed by ranged units before they can do anything

It may seem that siege equipment on defence is stellar early on, but you’ll find later that there isn’t any city banners that specifically boost siege equipment (some inadvertently do). Therefore it’s important to put archers, specifically gold archers on towers and platforms as they have the best range, and when boosted properly do the most damage. Trebuchets would be the only siege equipment I would recommend for platforms, if any. Currently for example my archers do approximately 240 damage at my keep, boosting can get them well over 300 if you have all rare banners later on.