We propose the following tutorials (the flag indicates the language of the resource):
Astronomical CCD Imaging, handbook on using the CCD and image processing, edited by E.Prosperi
Cielo: Observation and geometry of the celestial sphere and astronomical coordinate systems (by Appunti di astronomia)
Terra: Earth Structure and morphology of our planet, earth motions and astronomical phenomena (by Appunti di astronomia)
Luna: Description and aspects of our natural satellite with respect to lunar phases and motions (by Appunti di astronomia)
Sistema Solare: Facts and features of the Sun, planets, dwarf planets, comets, asteroids and other small bodies (by Appunti di astronomia)
Stelle: Stars: spectral classification, star evolution and astronomical maps (by Appunti di astronomia)
Galassie: The galactic system and our galaxy, the Milky Way, the Messier catalog of objects (by Appunti di astronomia)
Universo: Origin and evolution of the cosmos, according to the theory of Big Bang (by Appunti di astronomia)
We propose also following articles: