Beginner Bridge Bidding 1

This channel is meant for beginner bridge players who are beginning to learn how to bid. The bidding system used can be found in:
Anyone Can Bid:

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I liiked your pace, but you left a lot of unanswered question - for instance, at 1:35, you say 'shouldnt bet 2D, it wouldnt make any sense."

Why? For a new player, I have no idea why you wouldnt 'raise' the bid, so to speak. A quick explanation of these type of 'obvious' things to a skilled player would be helpful