FreeCAD has no Rib button like other CAD programs. Thats why you need to create a rib by drawing according to technical drawing. There are ways to create a rib; first way is by using a plane. I show it in this video. Second way without using a plane. This is easy one. After 2D design, you only change position of sketch.
When you change direction or angle of sketch in FreeCAD, we usually change Z direction and don't forget to use mid plane. When you watch video, you will understand better.
Technical Drawing of this video tutorial.
Video tutorial is below. I advise to you watch video to understand how to create a rib easily in FreeCAD.
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