1.Only invest what you can afford to lose.
2.Never invest in something you dont understand.
You wont immediately understand everything, thats ok. Do some research.
3.Dont day trade unless you spend a minimum of 6 hours a day on the markets.
4. Be patient and buy it on sale.
Yes, I agree with all your suggestions. You should not invest with money you cannot afford to lose and do not be greedy with your investment and take very good time to do a very deep research about the coin or project you want to invest in.