split up data portal list

Author: afeld

assignments/open_ended.md

@@ -24,7 +24,9 @@ For these assignments:
 
 ## Open data portals
 
-There are countless places to get data, notably:
+There are countless places to get data. Below are some examples.
+
+### Primary sources
 
 {% if id == "columbia" -%}
 - [Columbia Data Platform](https://dataplatform.cuit.columbia.edu/)
@@ -48,15 +50,21 @@ There are countless places to get data, notably:
 - [The Humanitarian Data Exchange](https://data.humdata.org/)
 - [Economic Policy Institute](https://www.epi.org/data/)
 - [Organisation for Economic Co-operation and Development (OECD)](https://www.oecd.org/en/data.html)
-- [Kaggle](https://www.kaggle.com/datasets)
-- [Google Dataset Search](https://datasetsearch.research.google.com/)
-- [Black Wealth Data](https://blackwealthdata.org/)
-- [DataHub](https://datahub.io/collections)
 - [Gallup Global Datasets](https://www.gallup.com/analytics/318923/world-poll-public-datasets.aspx)
+
+### Secondary sources
+
+- [Black Wealth Data](https://blackwealthdata.org/)
 - [Data Commons](https://datacommons.org/data)
-- Directories of open data portals:
-  - [DataPortals](https://dataportals.org/)
-  - [Open Data Network](https://www.opendatanetwork.com/)
+- [DataHub](https://datahub.io/collections)
+- [Gapminder](https://www.gapminder.org/data/)
+- [Google Dataset Search](https://datasetsearch.research.google.com/)
+- [Kaggle](https://www.kaggle.com/datasets)
+
+### Directories of open data portals
+
+- [DataPortals](https://dataportals.org/)
+- [Open Data Network](https://www.opendatanetwork.com/)
 
 ## Inspiration