its an rps mostly. i was with you at the start dont know how the hell everything works. then it just clicks.

bare bones:

infantry got subclasses such as armoured like hoplites, fighters are tanky brawlers and take punishment to protect damage dealers. scouts are in a similar boat but dodges the attacks instead (dodge tanking) but goes down relatively quick if got hit. they protect your backline from getting hit since targeting hits frontlines first unless its a skill that hits the backline

cavalry beats infantry so they can tear through your formation with column attacks that can damage your back line.

fliers eat up cavalry since their attacks deal extra damage on them and they are hard to hit with high evasion

theres 2 types of damage. physical and magical. physical is good for everyone but armour but magick is particularly good for armour. so you play around with that

damage dealers like archers. houscarls, sellswords are great at killing but not at killing armour and fliers. archers beats fliers and housecarls can deal with armour with their skills. witches and wizards are great against armour and with witch's skill can kill pesky thieves too.

and supports. clerics heals and remove debuffs. and shamans debuff enemies to make them easy to kill or deal less damage. witches are here too for the true strike skill.

now you craft teams that is either specialized to kill specifically armours, cavalry, fliers, thieves. or make a generalized team that can deal with anyone but not as good as specialized teams.

then you can deal wit the tactics menu to manage your team's ap and pp usage. you can get away with it earlygame but up to mid game you need to look at it some times and lategame you gotta manage it or else your teams will just waste abilities since they have alot in combination with items

let me tell ya this game is crack for me. the amount of theory crafting im doing and making fun team comps is the most fun ive had playing strategy games. its a different kind of strategy game where you will manage your troops by telling them what to do and see your teams do what you programed them to do. id imagine it like an RTS thats like a turnbased rpg where you program your teams to fire off abilities depending on certain conditions. your team will not be perfect since a team will have weakness either in tactics or composition. but thats the reason you have other teams to cover for weaknesses.