The fact that Bitcoin has been able to stand the test of time and show progressive increase ( also when there's bearish it's a predictable and reasonable one )makes me trust the digital currency and I started trading little fractions of it as I can afford as a student. Also it is a digital currency that is worthy of study because it has a seemingly strong foundation and the man Satoshi behind it really created it with a lot of potentials that keeps unfolding as time/years passes by! (Unlike so many  aircoins)