How to make grand strategy game like grand tactician?

hello my name is Andrea i am new to development , I have started used many engines like ue5, cryengine,amazonlumberyard,monogame,love2d,ct.js,godot,pspwrt etc…
but i dont understand how to make a grand strategy game , on youtube there isn’t a good tutorial.
so can I make this game on this engine ??
i am beginner , and i try to implement a star pathfinding , but always it don’t work.

How have you implemented the pathfinding? I assume it’s with the pathfinding behaviour. If so, what are the configuration settings?