After a month of hard work I have to pay quite a lot of things. I just got one about 200$ to invest in bitcoin. Should or should not. Please help me ! 
Of course you should. We are about to be a part of the largest transfer of wealth that the world has ever seen. I am predicting some poor third world countries will move entirely to BTC in the next 10 years. That will stabilize their monetary supply and allow its people to build wealth.
Buy BTCBTCBTC with whatever you can live without right now. But make sure you have a little "oh shit" fund in cade you need $$. That way you don't dip into your BTC, usually Murphy will arrive when BTC is down and you need cash now.
I don't think the Euro or Dollar will ever be replaced, but BTC will hit $1 million in 10 years.
We will be using Satoshis for buying coffee and bitcoin for buying houses.