How to keep your money when travelling?

I learned my lesson the hard way because during one of my travels I lost my money, atm cards and ID because I placed them all in my wallet. My friend told me that when you travel you must separate them so in case you lose one you still have some that you can use. So now I carry them in 3 containers. If you want to be more safe then you can place them where it is not obvious like inner bag pockets and socks. The point is to divide where you place them.