Investments for your bitcoin can generally be separated into several categories.
(1) High risk, high return
short-term trading strategy ("buy low, sell high"): But can you read the market well enough to generate the best trading strategy? For every buyer of a coin, there is a seller, so who is doing it wrong?
(2) Moderate risk, moderate return
portfolio investment strategy e.g. Keza (
http://www.getkeza.com) as an investment platform. But you need to invest time in selecting the right investment portfolios based on the composition, underlying beta and future outlook.
(3) Low risk, low return
secured lending strategy (collateralised lending). But need to vet borrowers based on past track record too.
Avoid HYIP, Ponzi schemes, and fanciful, unrealistic promises.
http://themerkle.com/bitcoin-investment-startup-keza-unveils-ios-beta-app/https://www.producthunt.com/tech/kezahttp://getkeza.com/ (It's free to apply for a Keza account)
Keza looks interesting. Where's the save-up and start your own business kind of investment here?
Is there somewhere complete list of all proven exchanges?
We could organized voting for the best exchange, or something like that.
No doubt Bittrex and Poloniex, are the best ones, but i wonder how good are C CEX, Bleutrade, Yobit and how they are in comparison, with newer exchanges. I believe first 10 places are very interesting for everybody..

No need, it's only BittrEX and Polo that would dominate. The other exchanges have only a fraction of their volumes.