When it come to building wealth via investing in crypto currencies, there are typically two types of strategies that you can make use of

• Taking long-term positions, focusing more on macro economics and asset fundamentals - HODL
• Taking short-term positions, focusing more on market cycles and technical analysis - Trade

It will be up to you to decide which strategy suits your risk appetite and investment goals.  

Smart contracts helps you digitally exchange something of value in a transparent, conflict free way while making sure that we will not be needing the services of a middleman to facilitate the transfer.

These transactions are generally trackable, irreversible and provides you with features like autonomy, trust, backup, safety, speed, savings and  accuracy.

Where can you use smart contracts? - pretty much everywhere from Financial services, Healthcare, Insurance to Supply Chain, Real Estate and Automobiles.

It's a scarce digital asset / commodity that can be used as a medium of exchange / storage of value that has all the properties of real money like scarcity, durability, fungibility, divisibility, portability etc.