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Question: How to use the “Cancel Command” button on R12? Answer: The default key for canceling commands in R14 is the “ESC” key. If you are used to using “Ctrl+C” in R12, you can click on Menu Tools\Preferences\Compatibility\Priority for accelerator keys\AutoCADclassic; this will allow you to use “Ctrl+C” to cancel commands, while the “ESC” key will still remain functional. Question: How to cut multiple line segments at once? Answer: When the TRIM command prompts you to select the graphics to be trimmed, the common selection methods of window and crossing are not supported. When cutting multiple line segments, multiple selections are required to complete it. At this point, the fence selection method can be used. When the trim command asks you to select the graphics to be removed, enter “f”, then draw a dashed line on the screen and press Enter; all the graphics that intersect with this dashed line will be deleted. Similarly, for the EXTEND command, entering F when prompted with \"select object:\" allows multiple entities to be extended at once. Question: Why did the deleted line reappear? Answer: The most likely reason is that several lines overlap each other. This is a common problem for beginners. Also, when a center line or dashed line remains a continuous line regardless of how the line width ratio is changed (after REGEN), this is most likely the reason as well. Question: How to quickly switch layers? Answer: Click the “Make objects’ layer current” button on the “Object Properties” toolbar (the button on the far left of the toolbar), then select any object on the layer you want to switch to in the drawing area; the current layer will immediately change to the layer containing the selected object. Question: How to handle manually drawn drawings, especially those with many previously hand-drawn engineering plans? Answer: Scanning the drawings into a computer might be a solution. But note that the graphics processed by AutoCAD are vector graphics, while scanned drawings result in raster graphics. Due to this difference in nature, although graphic files generated from scanned drawings can be inserted into AutoCAD, they can only be viewed and not edited. There are also some vectorization tools that can convert raster images into vector images, but due to technical limitations, the efficiency and quality of such conversion are not satisfactory. The author has tried various such tools, with disappointing results. (If there’s time to deal with that, it’s better to draw it over again.)