Let’s isolate trends from the overall chart picture and analyze them.
Pullbacks
A pullback occurs when prices briefly move against the trend and then resume the original trend direction. When pullbacks happen, there are market participants who trade against the trend (which is not recommended). When the trend continues, these participants may be forced to sell (or buy if they were short) via stop-loss orders, which can support the original trend.
So, pullbacks are something you should definitely consider when trading trends. If you are scalping, there is also a chance that prices will at least return to the previous high or low.

On the other hand, it is strongly discouraged to enter a trend at its high or low or near of it. Even if the trend continues, you risk getting wiped out by a pullback.

Good Trends
Good trends, when observed from a price action perspective, are characterized by being long-lasting, steadily growing trends that do not progress too rapidly and include regular pullbacks. You will develop an eye for identifying them. Here is one example:
