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Learning from Light is a set of pages tackling how we use light to learn about the Universe. Sections include how to measure a spectrum, spectroscopy in space and spectroscopy as a tool of astronomers. It is part of the outreach material developed for the FUSE UV space-based telescope program.
Spectra is an excellent site written by Prof James Kaler, author of classic books on stellar spectroscopy and stars. There are thirty subsections each of an effective length and easily found.

Australia Telescope Outreach and Education list of good spectroscopy sites for Astronomical Spectroscopy, Catalogs and Sources of Spectra, Applets, Activities and Software.