Each time you see the price bounce off the same line, the more likely it is that others are watching it too and are playing the same game you are. This could help you get several good entries in a row, but remember trend-lines won't last forever. So you want to make sure you set proper stop losses to get you out quickly if the support/ resistance trend-line eventually fails.

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An upward slanting (Bullish/ Ascending) trend-line indicates price has been trending up, so you want to look for buying opportunities. Buying opportunities occur when the price drops down and comes close to the 3rd trend-line bounce as displayed below.