Can anyone tell me what they are and how they matter? In simple accessible language please 
I have 7 grand to invest in stocks and shares isa and I have little idea of what to invest in.
I've read several large platforms website and funds and it seems fundsmith, and lindsell train area the go toos.
And perhaps some other ones round the world with more global stuff?
Why do people invest in bonds as well!
What would be a good portfolio thanks.