These sites were very useful to me when I started amateur astronomy, mostly to learn what kind of equipment I needed to get:
If you know another good site for beginners I'll be glad to evaluate it and include in this list.
Monitor calibration

Adjust your monitor to see all grey boxes
Recommended sites
- Alpha Centauri (Carlos di Nallo)
- Astroblog (Alberto Ceretta)
- Astrofotografia Uruguay (Jorge Quiñones)
- Astronomía y Astrofotografía en Uruguay (Gerardo Addiego)
- Astronomo.org (Forum about amateur astronomers observations)
- Astronomy For Beginners
- Espacio Profundo
- Fotografía Astronómica (Carlos Scarsi)
- Infobservador (Claudio Martínez)
- Kappa Crucis Observatory (Alejandro Garro)
- QCUIAG (pioneers in amateur astrophotography)
- Telescopes
- Zemiorka (Astronautics ans space exploration history)