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

No, investments are always a bit risky. But if you invest today buying BTC and secure them in a cold wallet, I believe price will rise in next years, if you look at the big picture.