Technical analysis makes the assumption that history repeats itself.

Any trading method or system that works well on a broad sample of the
historical data, may have validity when applied to futures trading environments.

Commodity Charts Reminder: One should keep in mind that the markets are dynamic.
The forces that motivate price movement are dynamic, and can be seen on any chart
And the commodities traders and participants are dynamic.
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Click here to learn about Chart Top and Bottom Formations

Therefore any system which has performed well on past historic data may decline in value as the evolving dynamics of the markets change over time.

The assumption is made that trading results can be improved when trading skills are improved. This requires practice! Surely any time spent learning to trade on past historical data, using a commodity charts will not be wasted when it comes to preparing to trade for the future.

Commodity Chart Videos
1-2-3 Formations
50% Retracement
Head and Shoulders
Chart Channels
Support and Resistance