Какой, такой, как, так
Какой, такой are used to designate the description of an object.
Example: ТАКОЙ торт мне нравится. ('такой' means 'such', 'I like the description of that cake: it has enough of cream, of layers, and has а nice decoration' - the cake itself is described).
Как, так are used to designate the description of an action.
Example: Я хочу, чтобы ты всегда ТАК делал торт. ('так' means 'this way', 'I want you to do it only like that, I like only this way of making cakes' - here an action is described.)
Colloquial usage is more broad of course. We can use 'какой, такой, как, так' variously in a conversation. Also, there are some constructions with these pronouns. But generally we use them the way I have explained. I'm open for questions:)