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The spacer has settings from XS to XL. Please make sure to always use the same size for desktop & mobile (unless you really need to change it ;))

The Alignable Content let's you align content next to each other (2 column content). You can set the positioning for vertical and horizontal alignment.

Use for grouping content. All have a full width or normal width option to choose from. 
For the 1Col Content there is an additional option to define how much space you want it to use (eg. 80%)