I just hold, everytime I tried to play the market I lost some coins.
Buying is just like investing but it's just gaining a profit through holding what you buy in low value and sell it when it is increasing. That's everyone idea to have an income.
Work efficiently and with great care because this is not the market in which you can decide anything with random decisions. This needs your attention with great care and to you have to put the market rules in al your actions so you may be able to make huge profit. Market lets you buy Bitcoin when the value is low then the market will charge you less and will give you large quantity Bitcoins.