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The Trader's Toolbox posts are just another free resource from MarketClub.
"Although many of you will find this lesson in one of the most basic concepts of market behavior “old hat”, it never hurts to review. One of the first things a new trader is told (I hesitate to say learns as many never do) is to buy a breakout above resistance and sell a fall through support.
Resistance is the level which holds a market down, while support is an area which props up a market much like a ceiling and a floor. The key is to identify the critical levels. There are a number of methods to determine support and resistance: trendlines, moving averages, retracements, Gann angles, etc. However, simple observation can be an effective means of locating the important areas. A quick glance at the October cotton chart reveals the most basic levels of support and resistance (broken lines)..."
Revisit the Trader's Toolbox Post: "Support & Resistance" here.