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    FACE ORIENTATION

                     In 3D modelling, each face has a front and a back. Correct shading and lighting depend on the
                     front side (the normal) facing outward. If the face is flipped, it can cause shading issues or make
                     objects invisible in games or renders.

                     To Enable Face Orientation, follow these steps:
                     Step  1    Go to the 3D Viewport.

                     Step  2    Click the Overlay button in the top-right corner.

                     Step  3    Check the Face Orientation checkbox.
                                  Blue faces = Front side (correct).

                                  Red faces = Back side (flipped).

                     Step  4   Click the Mesh option on the top menu bar.

                     Step  5   Hover over Normals from the dropdown list to open the submenu.
                     Step  6   Select the Flip option from the submenu.

                     The selected faces will flip, changing their orientation.

                               LOCAL & GLOBAL AXIS

                     In 3D modelling, objects can move, rotate or scale using two axis systems:

                        Global Axis: Refers to Blender’s main coordinate system. The X (red), Y (green) and Z (blue)
                        axes remain fixed for the entire scene.
                        Local Axis: Refers to an object’s personal axis, which moves and rotates along with the object.

                                                                                                      More on Blender  137

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