Why so heavy on T12s?
T11s and T12s have a different mechanic than the rest of the tiers. Whereas normally a troop attacks the Lowest HP enemy in range, T11s and T12s attack from the Highest down. This means that if you have T13s, your T12s are protected on both sides by higher and lower HP troops. Meaning that they get several rounds to fire on your enemies upper tiers unmolested. There are many different philosophies on the ratio of T13s to T12s out there and almost everyone will tell you something different and give you a different reason. The most common ratios you will see are 50:50, 60:40, and 30:70. I tend to lean between 50:50 and 60:40 myself but that's just a preference. Play around a little bit and find what works best for you!
Do I NEED layers?
Yes, absolutely. Each layer buys you a round in combat. If you aren't using layers and your enemy is, you will suffer severe losses even on attacks/defenses that are troop type counters.
How big should my layers be?
At very minimum your layers should be at least 500, preferably 1k. Some people choose to use larger amounts of layers but that's a preference thing and you can try different things and figure out what you like best. I personally use 2k most of the time 😀
Do I include ____ in my ____ preset?
Yes! Every preset, for every troop type, needs full layers! Every troop type; every tier you have. Do me a favor and trust me when I say that you NEED layers for everything.
What do I do if I don't have the tiers shown in the examples?
Just mimic what you see but adjust down for what tier you have, heavy in the top two tiers you have for that troop type. Don't forget proper layers!
Can/Should I do mixed marches? ex) half archers, half cavs?
Can you? Yes. Should you? NO. There's two primary reasons why you shouldn't mix marches. First off, when you hit something/someone you are usually looking to counter a specific troop type. If you mix a march, then no matter what you are hitting, one of your troop types in the mix is going to be directly countered by what your enemy has, causing you extra unnecessary losses. Second, if you build a General to be hybrid of two troop types, then neither of those types is going to be fighting at their maximum strength as the General's gear/refines will be split between the two. This puts you at a severe disadvantage in all attacking scenarios as you want the troop type that you are using to counter your enemy to be as strong as possible to maximize damage and minimize losses.