Some basic information about the sagas can be found here on my blog.
Good introductory overviews to the saga corpus and historiography can be found in
- The Routledge Research Companion to the Medieval Icelandic Sagas, ed. Ármann Jakobsson and Sverrir Jakobsson (Routledge, 2017);
- The Cambridge Introduction to the Old Norse-Icelandic Saga by Margaret Clunies Ross (Cambridge, 2012);
- Individual chapters in A Companion to Old Norse-Icelandic Literature and Culture, ed. Rory McTurk (Wiley-Blackwell, 2005).
Many manuscripts that preserve texts of the sagas are part of the collections housed by the Stofnun Árna Magnússonar í íslenskum fræðum (Reykjavík), Landsbókasafn Íslands (Reykjavík) and the Arnamagnæan Institute (University of Copenhagen, Copenhagen). See https://handrit.is/en/ for the joint online catalogue records and links to images of many manuscripts.
For information about the edited texts used on this site, see notes under ‘Technical’.