Previously you learnt that there are 3 time frames in the market – short, medium and long term. Support and resistance lines also follow the same guidelines. In a medium term trend you could draw several short term support and resistance lines while a long term trend would contain several medium term support and resistance lines.

Using our example above, we can redraw this chart with several shorter term trends –

Shown here are a few valid support lines. Where as we had one support line before, we can draw a number of shorter support lines. The resistance lines have been omitted to make the support lines somewhat clearer.

The question is which line is worth taking note of? The answer is all of them as it depends on what type of trend you are trading. If you are trading medium term trends, draw medium term trend lines. If you are trading short term trends, draw short term trend lines. At the extreme, if you became a intraday trader, you would be drawing support and resistance lines on charts that shows what happens every few minutes.
A final point of support and resistance lines is that if you have a rapid increase in price giving you a steep but short term support line together with a longer term but flatter line, bear in mind that the market will not be able to support the short term momentum for long and the market will fall to the medium term line at some point.