No. 1 - BUY ONLY VALUABLE COINS
No. 2 - NEVER SELL A COIN IN LOSS
No. 3 - WHEN YOU ARE IN PROFIT WITH A COIN SELL ONLY A HALF OF YOUR AMOUNT
No. 4 - NEVER LISTEN TROLLBOXES
No. 5 - DON'T INVEST ALL YOUR CAPITAL IN ONLY ONE COIN
The Key of Trading is : 
I don t agree with No. 2 , I don tlike the word NEVER , sometimes it can be important to sell if you can clearly see that the coin has no chance to come back , for example if there are bugs or other issues that destroy the trust in the coin ... better get some money back instead of loseing it all.
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learnt rule 2 the hard way hahahahahaha
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I can agree with all your points, however, there are no equal rules for everyone, as each person has their own trading style. I mostly hold and when a coin doubles in value I sell only 10-20% and wait for a dip to buy back in. Someone else maybe doesn't have that much patience and sells sooner or in larger amounts, but this is also good.
You forgot one very important rule for trading - learn fundamnetals and basic techinical analysis.
Buy fear, sell greed :)
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