1. INTRODUCTION
2. GALAXY SAMPLES AND SIMULATIONS
2.1. Ly α Emitters: The HETDEX Pilot Survey
2.2. Continuum-selected Photo-z Galaxies: The COSMOS/UltraVISTA
2.3. Bias and Mass Matched Catalogs of Mock LAE
3. LARGE-SCALE STRUCTURE AT $Z=2.44$
4. COSMIC EVOLUTION OF THE STRUCTURE
5. EXTENDED Ly α HALOS AND AGNS
6. PROTO-CLUSTERS IN THE HETDEX SURVEY
7. DISCUSSION
8. CONCLUSION