You can think of put condor spread as simultaneously running an in-the-money short put spread and an out-of-the-money long put spread. Ideally, you want the short put spread to expire worthless, while the long put spread achieves its maximum value with strikes C and D in-the-money.
Typically, the stock will be halfway between strike B and strike C when you construct your spread. If the stock is not in the center at initiation, the strategy will be either bullish or bearish.
The distance between strikes A and B is usually the same as the distance between strikes C and D. However, the distance between strikes B and C may vary to give you a wider sweet spot (see Options Guy’s Tips).
You want the stock price to end up somewhere between strike B and strike C at expiration. Condor spreads have a wider sweet spot than the butterflies. But (as always) there’s a tradeoff. In this case, it’s that your potential profit is lower.