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You may select multiple items from each list by holding down the Ctrl (Mac: command) key while left-clicking each item.

Not selecting any type is the same as selecting all types. The total count of all types is 2926.
This is a theme for your stuff, it can be like love, gender, etc. If the theme is not on the list you can create another one.
Here you will find the world-views from a personal perspective of the contributors. Its not meant to a definitive explanation, just a pointer.
Please use to describe the 'stuff' e.g. teaching material