I know the game itselfs has a Encyclopedia but it's pretty annoying, chaotic and web based.

I mean, If I need money, food, order or wathever I know what to build, but I'm never sure if that building I'm spending my money will give me in the future cool units or not, If I will not able to get some troops because I did X building inxtead Y, and it forces me to destroy very advanced buildings in late game because that city I wanted to be a military one it's just a town of ♥♥♥♥♥♥ units because the city itselfs doesn't allows you to build that building you need (and no mention about how confusing are the names of the different buildings: 'Chieftain Tower, Chieftain Hall, Mead Hall, Chieftain Household, Royal Household.). Just one question: Does anybody knows if there's some quick scheme or easy guide with the units and buildings tree for the barbarians factions? I've got several hours of this game, mainly with the Saxons with very cool results but sometimes I feel frustarted because I got the annoying feeling of having zero idea of what I'm building.

Total war attila building tree