Auto-Complete Polygon 
When you sketch blocks, territories, or districts, there must be some boundaries connecting with the polygons. So, you can use "Auto-Complete Polygon" tool to reduce the cost of sketching boundaries. First of all, click "Start Editing" and select the target layer. Click "Sketch Tool" and "Auto-Complete Polygon" tool. Then, sketch the start point in the polygon which has the same boundary with the new polygon and sketch the following vertices. As you are sketching the last vertex, you should sketch the end point in the polygon connecting to the new polygon. Eventually, you can double click or right-click to click "Finish Sketch" to finish the sketching. Besides utilizing "Sketch Tool" with "Auto-Complete Polygon", you can apply "Midpoint Tool", "Nearest Distance Tool", "Rectangle Tool", or "Circle Tool" to sketch polygons.
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With "Sketch Tool" |
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With "Rectangle Tool" |
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With "Circle Tool" |
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