I think it only makes sense
to seek out and identify structures of authority, hierarchy, and domination in every aspect of life, and to challenge them. Unless a justification for them can be given, they are illegitimate, and should be dismantled, to increase the scope of human freedom.
That includes political power, ownership and management, relations among men and women, parents and children, our control over the fate of future generations (the basic moral imperative behind the environmental movement, in my view), and much else. Naturally this means a challenge to the huge institutions of coercion and control: the state, the unaccountable private tyrannies that control most of the domestic and international economy, and so on. But not only these.
That is what I have always understood to be the essence of anarchism: the conviction that the burden of proof has to be placed on authority, and that it should be dismantled if that burden cannot be met.