In bitcoin yes the price is almost stable but with greater number of it you could feel the surge. In altcoin though, there is always a lot of movement. It fluctuates everytime because of the cheaper price, a lot could afford it and the demands goes up.
It would not be and ideal to trade on bitcoin if you do have only small amounts on it because you wouldnt really feel the profit when you intend to sell. Yes bitcoin price is somehow stable for now and only moves a little compared to altcoins which you could somehow make decent profits if you correctly invested to a certain potential coin though.
when we trade, it is always a good way to have a big bankroll in order to get some significant amount of profit. Otherwise, you need to value and be happy even in a small amount of profit. When you get the hang of it and is now comfortable with your betting, then it is high time to invest more to your bankroll and apply your strategies.