Hi guys i just wanna know is there any risk free way to invest bitcoins so they guaranteed grow
It doesn't matter if interest is low but just want to know if there is some place or site in which we invest bitcoins and our bitcoins are secured and we get guaranteed interest(doesn't matter if low)
please help i am newbie in this

There is no risk free way to invest anything of any value, so no, there is no way to invest your Bitcoins risk free.
I do have an investment in Just-Dice that I think is about as risk free as it comes, but that can go us as well as down, I guess I mean the house edge is in ma favour and I don't think Dooglus will run off with my money.