The summary of this advice is you should buy Bitcoin and and altcoins and the forget about it. When you buy something and you forget about it, all you have listed as advice wouldn't necessary, you wouldn't be bothered to look at your wallet, you wouldn't be emotional about it and anything sentimental about it wouldn't move no matter the condition of the market.
Don't forget to use the funds you can afford to lose, this will help you very well on holding your coins otherwise you will be feeling as if there is a big load on your head. There is nothing that is going to be sentimental about Bitcoin that will ever move you. Even if there is a crash, you wouldn't be move about it unless your target is reach before you attempt to sell your coin and this is not only to Bitcoin but all other coins.
Yes, it should be using cold money, or indeed the funds have been provided for long-term investment, then from that you will not panic and know the clear direction where you will run even though the trend in the market fluctuates, if your sentence is used it is the same as playing gambling on an asset that we invest in and hope to become a dragon one day.