If you decide to invest, spread your investment. Categorize the possible investments you like into categories such as "no risk" "very low risk", "low risk", "high risk", "very high risk". They decide what you want to spend in. Investing in Bitcoin might be a good idea indeed, but I won't invest everything into it. I would categorize BTC in the "high risk" category I guess..

Real estate might also be a good investment. Currently here in The Netherlands, I think there is a quite good possibility to step in investing real estate (house prices are rising and rising, probably also because of the cheap possibility to loan money).

Exactly, but in my case i use to invest some on trading ,and in other legit site. I want my money grow than stocking it on my wallet, so i do trading for investing and doing campaign as my sideline.

some people actually no need to save because they already got what they want but still they need saving too for their future if suddenly in one day you loss your in you investment, altough you are rich may be in one day your money will be all gone and this saving will help you but it can't provide all of your loss, at least it can help you a little bit

but in reality to the current investment in bitcoin still has a big risk. such as Ponzi and other sites-many.
but I also believe that if in the future, investment bitcoin will be better than gold.

You can earn interest by putting money in a savings account, but savings accounts generally earn a lower return than investments.

You can still lose money even if you save. In a matter of time, inflation will eat away the value of your savings. The amount will still the same but its worth will not be the same over time. Unless you have something that can make your money grow constantly and greater than inflation, your savings is not good option.

I think investing in ponzi could be profitable. I've tried it but of course you need a little tricks and strategies,
you have to look at various aspects such as the age of the site, the quality of JS site etc

Im not sure where do you get this number from however bitcoin has been dropping more than that in a day, approximately around over 35 % ~ in January 2015 and yet still it stands strong with this many supporters although it has been claimed as dead coins by many media. As for the halvings, it is totally a speculation based on previous experience

In my view its better to focus on 90% into saving and 10% in investing..either trade stocks, etc.

The principal would make up for potential loss of all investing and grows based on interest.