Update index.md

Author: ShujieL

index.md

@@ -7,7 +7,12 @@ permalink: index.html  # Is the only page that doesn't follow the pattern /:path
 > Knowledge of CERN ROOT and/or Python/RDataFrames
 > This tutorial follows other tutorial in the EIC series:
 > - [Setting Up Your Environment](https://eic.github.io/tutorial-setting-up-environment/)
->
+> - [DD4hep Simulation](https://eic.github.io/tutorial-simulations-using-ddsim-and-geant4/)
+> - 
+> Recommended:
+> - [Geometry Development](https://eic.github.io/tutorial-geometry-development-using-dd4hep/), section 1
+> - [Reconstruction Algorithms](https://eic.github.io/tutorial-reconstruction-algorithms/) , section 1, 6, and 7
+
 {: .prereq}
 
 {% include links.md %}