Don't invest all your saving, I will never do it maybe I am wrong but someone gives me a good piece of advice when I started to invest : don't invest much that you can affort to lose. If you feel pretty confident, I would say 20% of your total is already a very nice amount to invest
Dividing is the best thing in these cases. Investing the all money into one asset is really dangerous and if something bad happens, it would turn into a nightmare for you. Better having portional ratios.