When you have 3D solids and regions drawings you can flat them to 2D views by using the command FLATSHOT. It will create 2D representations of the current view that you have on your screen at execution of the command. The new 2D entities will be generated as a block projected onto the XY plane. You can always modify the block later since it is comprised of 2D geometry.
That is very helpful, especially when you are working with 3D or dxf files. I know a lot of manufacturers have their online catalog cut drawings in 3D format. So that would save you some time and trouble.

You can use VPMAX  (same as double-click within a viewport layout) or VPMIN (same as double-click outside a viewport layout) to switch within model space and paper space tab of a layout.
VPMAX expands the current viewport for editing and VPMIN restores the current layout viewport.
The advantage of using these two commands is that you can pan and zoom while you are in model space, and when you go back to paper space the position and scale of the objects in the layout viewport remain unchanged.
It is useful when you zoom in a viewport on paper space while your viewport borders are not visible and accidentally double click inside the viewport and you cannot double click out.

Use this command If you need to quickly rotate the crosshairs on the screen at a specific angle so you can draw along any object alignment without having to change The UCS settings nor rotating the view:
In the command line type SNAPANG. When prompted enter the new angle rotation for the crosshairs.

Have you noticed that when you double click inside a viewport in AutoCAD, the view automatically zooms out and then you have to rescale the viewport? It could be really annoying, especially if you do not know the original scale of the viewport. Well, it has something to do with your UCS setting. To correct that, you need to change the UCSFOLLOW value to “0”.  To make the change, try this: while inside the viewport type UCSFOLLOW in the command line and enter “0” for the value. That corrects only the current viewport, because the UCSFOLLOW setting is saved separately for each viewport. Apply the same method for each viewport

To prevent a block from being exploded when inserting the block use the command MINSERT. When prompted, set the number of row or columns to any numbers except 1. Then go to the property of the block and change that row or column back to 1. This will prevent the block from showing as an array. This command is also good if you want to create an array with a block.
NB: You cannot use MINSERT with annotative blocks.

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If you need to reload quickly all xrefs (external references) in a drawing without going to the External Reference dialog box,
right-click on the xref icon in the status bar tray located in the lower right-hand corner of your screen

and select “Reload DWG Xrefs“.

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