structure of overview.rst
Overview
========
-TODO: give a big-picture overview of Gammapy
-
+**TODO: give a big-picture overview of Gammapy**
Should be a 5 - 10 min read, including nice diagram figures.
+Gammapy workflow
+----------------
+
+- From Datastore to Observations to Datasets to Fit.
+- How Analysis orchestrates this.
+
+DL3 data format
+---------------
+
+- Events (link to relevant doc)
+- IRFs (link to relevant doc)
+
+Data reduction
+--------------
+
+- Producing reduced data to prepare for modeling and fitting.
+- Rapid description of the typical data reduction chains (possibly link to some notebooks)
+
+Modeling and Fitting
+--------------------
+
+- Forward-folding and Likelihood-based analyses (link to stats)
+- Models (link to model.ipynb)
+- Typical operations with links to notebooks
+
+
See https://github.com/gammapy/gammapy/pull/2463
