Can anyone explain why when you select the Enrichment activity, it gives you the option to select "Data linked to a filtering condition:"
...but then when you select that option, it gives you two (2) options: 1) for "Data of the filtering dimension, and 2) for "Data linked to a filtering condition":
I am guessing the the initial selection naming (see first image above, 'Data linked to a filtering condition') is just a naming convention, since the option really also contains, 'data of the filtering condition' as well.
The initial "Data linked to the filtering dimension" can be considered as a category to differentiate it from the other options here which are totally different (external data, offer, link).
Then you have to finetune that choice by specifying if you want actual data of the filtering dimension (fields), or linked data (fields from tables related to this dimension).
As a side explanation, this is an historical label, and at the beginning Adobe Campaign was... coded in French, then translated into English. Since the first time this feature was added, it stayed that way.
The first term is simply seen as a overall category, even if the same one appears again after that.
I'm sorry if that confused you in some way and I hope it is clearer now.