1. Invest in Bitcoin with your spare money:
I can say that this advice is not necessary in today's bitcoin world. This advice was only relevant like a decade ago when bitcoin was been seen with alot of skepticism. Some saw bitcoin as gambling, some saw it as a ponze scheme while others saw it as a bubble the will burst.
In today's bitcoin, we know that if you invest with your spare money you may never make any fortune from bitcoin.
I keep on saying it and I will continue to say it, always invest your spare money, don't invest what you think will affect you after making investment, you don't have to starve just because you want to invest, have seen some people investing almost all their money in bitcoin, which at the end they won't be feeding well. I will still say it again invest your spare money.
2. Invest what you are able to lose;
I have a question!
Who has ever lost in bitcoin? I do not find this advice pleasant to bitcoin. Although, this is a kind of general advice for assets that are volatile. But with bitcoin having proven that it can resuscitate after crash, the advice should be rephrased as Invest what you will not be needing in the next few years. It will not be advisable to use the money meant for your childrens school fees for bitcoin. Just have an investment budget from your income that will not negative alter your living state. Then, when you invest for 3yrs to 5yrs duration, there's no how bitcoin will fail you.
Don't think because everyone have been saying invest in bitcoin and then you will end up selling your propertie and investing in bitcoin, it's really wrong, their is risk in every investment and we all have to always apply risk management, in bitcoin investing any amount you can afford to lose is part of risk management, I won't recommend anyone to invest all their money in bitcoin.
3. DYOR (Do your own research):
This advice should be for altcoin investors. If I may ask, what kind of research is one, especially a newbie expected to make in bitcoin. Are they researching the road map of bitcoin or are they researching the developers behind it? The right thing is to know when to buy. Simply buy low and sell high.
If am introducing bitcoin to a newbie, then I will tell them to go and do more research, they should go on their own to learn about bitcoin, what bitcoin is all about, what's bitcoin aim, and other necessary things I think the person should know. I won't just introduce you to bitcoin and I will ask you to invest immediately, we should all have proper understanding about what bitcoin is all about.