Some Bridge Don't's:
Never lie about your major suit holding. Lie about your minor suit holdings all you want - bid three card suits, two card suits and singltons or voids. If you respond 1
to an opening bid always have at least four spades.
Don't double slams unless it is a
Don't be 'pigish'. If you are already getting a top don't try for more. Two examples:
If you try to sacrafice at 4 and they bid 5, do not double them. Most pairs will be in 4. You will get a very good board by defeating 5, not doubled. You gain little or nothing by doubling; however you will get a bottom if they make 5 doubled.
If the opening lead gives you a trick which allows you to make your imposible contract, do not risk your contract even slightly for an overtrick. Take your good result and run.