Knowledgable

He's knowledgable about a variety of subjects.

She's knowledgable about ethnology.

Those football crowds, if only he got among them, he would find are not great ignorant mobs of sadistic morons. They are a pretty good mixture of just ordinary men. A little puzzled, a little anxious, steady, sceptical, humorous, knowledgable, having a little fun, hoping for a bit of excitement, and definitely getting quite a lot of enjoyment out of that glorious king of games – football … I'm sorry for George. He's missed a lot of fun in life.