developing dark squared bishop


Can you see the verbiage, and the diagrams? I can see the verbiage for a couple of seconds, and then it disappears???

I highlight it with the mouse then I can see it
Sorry 'bout that. No idea why its acting up.

I feel like as long as you develop the bishop to an active square that the position calls for, you will be fine.
Sometimes in different positions you will not be able to put your bishop on c4 or b5(for white) or c5 or d6(with black) for example.
It takes some knowledge of positions to know how to develop your pieces properly and understand how you can use them to the best of their ability and due to this it determines where a piece such as the dark squared bishop could be and where it could be best placed in the position(typically in the opening and middlegame phases of the game.)
Hopefully this was helpful to someone.
After 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Bc5 (order not important)
What is the best move to release the dark squared bishop?
I often play h3 before d3 because I don't know how to handle ...Ng5
Or is d4 still a better move even though black has two pieces and a pawn controlling d4