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Crochet charts are not ideal for first time crocheters. Charts are usually included with complex crochet patterns as a way to clarify the design. They may be highly confusing for someone who is new to crochet for this reason. Before you dive into using crochet charts, develop your knowledge of crochet stitches and techniques as much as possible. Crochet charts are not meant to completely replace written instructions. The chart is a complement to the written instructions. Make sure that you read the instructions for your pattern as well as the chart to determine how to complete your project. Crochet charts are meant to be read from the bottom to the top. Work the rows in the same fashion as you would crochet them: start at one end, work across the row, then go up to the next row and work across that row in the opposite direction as the first row. In other words, you will be working from the bottom to the top of the chart in a zigzag fashion.  The only exception to this rule is patterns that need to be worked in the round. For a pattern that is worked in the round, start at the center of the chart and work around in a counterclockwise fashion or as indicated by the chart.  Some charts also include numbers and arrows to help you know where to begin crocheting and how to progress. You may see these numbers and/or arrows on the ends of the chart or within the spirals for a pattern that you work in the round.
Develop your crocheting skills before using crochet charts. Refer to written instructions in conjunction with a chart. Read the chart starting from the bottom.