The most importent topic to grasp is that space-time is a constant. That is: space*time = K. Observe it in motion below as it moves to the right with an increase in speed. Note length and width at .5 c, .866 c, and .95 c where length X time = 1.
Time (height) is represented by time period. The longer the period, the greater the distance between the tick and tock. Time slows.