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8,218 PointsJust wanna confirm some url, syntax in this course are not usable. They update new directory and syntax.
As mentioned, In case you do not know where to find the material in the videos. USE THEM.
For example: +DO NOT USE THESE: Contextual colors and backgrounds: http://v4-alpha.getbootstrap.com/components/utilities/#contextual-colors-and-backgrounds m-t-3 m-b-3
+TRY THESE: Contextual colors and backgrounds: https://v4-alpha.getbootstrap.com/utilities/colors/ Button examples: http://v4-alpha.getbootstrap.com/components/buttons/#examples Spacing classes: https://v4-alpha.getbootstrap.com/utilities/spacing/ mt-3 mb-3
Hope you do not waste your time like I did. :D