In the future, cash will gradually be replaced by cryptocurrency because of its convenience as well as its safety. Over the next 20 years, as people move their transactions over the Internet, cryptocurrency, especially Bitcoin, will leverage its strength to become the most powerful currency in the world at the time.

I think you should take a look at Xiaomi product. It's very good

With small amount I think you should choose some altcoin with low price like dogecoin, Siacoin,...Try to buy some then hold them for few days or weeks. It's the only way to trade with small amount of Bitcoin. But I think you should try to earn more then join trading when you have at least 0.1 BTC.