WHEN market on the way of rising-what will you do?

WHEN market is rising{on the way of rise}, you can earn more profit from stock- which have your account,this is very easy-
suppose you bought "a" company's stock for 100 taka-after 2 day it's prise is increase at 106 taka.
now what you do?
you sell your stock or buy more for increasing your profit.as you wish,
but you should'nt sell that stock at a lower profit when this start running,
[nb: this system works very well for fundamentally strong or future strong based share]