These Help pages can be downloaded here with the Winning Bridge Shareware game for Microsoft Windows 98, ME, 2000 and XP.
If you would rather read a book, take a look at the Help Index page for some suggestions.
Benjamin Option
2 Clubs: shows an normal 2 level opening hand in a suit.
2 Diamonds: shows an normal 2 Clubs opening hand.
2 Hearts or 2 Spades: 6 card suit with at least Q-10 high, less than 10 points.
The weak (0 - 7 points) response to 2 Clubs is 2 Diamonds. A response of a suit should indicate a minimum 5 card suit, and a response of 2 No Trumps shows no 5+ card suit. Opener would normally respond by showing their 5+ card suit. Bidding would then proceed to agree a suit and possibly to find a game contract.
The weak response to 2 Diamonds is 2 Hearts. If opener then bids 2 No Trump it shows 23 - 24 points and a balanced hand. Bidding should then continue as following a 2 No Trump opening. Any other bidding sequence is forcing to game with a good chance of a slam. First suit that is bid by either player should be at least 5 cards long.