Thanks for that part, I will also like to ship in some things that can really help as well.
1)don't be greedy when trading
2)never sell in lost
And as you said that they should invest what they can let go and applying these too methods you will find crypto very interesting .
I don't think your second point is right. I think sometimes you need sell whenever you're in loss, so your money didn't stuck at one coin and you can gain a profit on another coin to cover up your lost.
But remember to collect some news about your investment before you buy or sell something