John Lindow's "Norse Mythology: A Guide to the Gods, Heroes, Rituals, and Beliefs" is one of three important reference works on the subject currently or recently available, following Rudolf Simek's heavily linguistic "Dictionary of Northern Mythology" (German edition 1984, translated by Angela Hall, 1993) and Andy Orchard's "Cassell's Dictionary of Norse Myth & Legend" (and slightly variant titles, 1997). Each of the three takes a different approach, and I have found them nicely complementary.
Lindow's coverage, which is well-described in the subtitle, is not as complete in some areas. He does not try to match Simek on, say, Roman-era inscriptions, or Orchard on individual Icelandic sagas. In what he does cover, he is generally more comprehensive, and sometimes, I think, clearer (as on, say, the limited evidence for Norse religious practices). Lindow's discussions of methodologies and theories are informative, useful, and at times even entertaining. On this basis, it might well be a better book than the other two for beginners, although it should appeal to a more advanced readership as well. There is, of course, a trade-off, and some will prefer Orchard's more extensive coverage. (Where beginners in Norse mythology are concerned, Simek might be left to those approaching from a fairly advanced linguistic-oriented background, anyway.)
The black and white illustrations are well-chosen, and most of them are clearly reproduced. Bibliographic notes to the articles are supplemented by a section of bibliographic essays (including Internet resources). Again, he provides less raw information than Simek and Orchard, but his presentation is better, and, once again, probably much more useful to a novice. (Mind you, I've been reading in the field since the middle 1960s, and took several relevant courses at UCLA in the 1970s, so I'm using a little imagination; but he tends to suggest books I then found helpful, and many I have wished had been available when I needed them.)
Those already familiar with some earlier popular works on Norse mythology will probably recognize the cover art (part of a reconstructed medieval tapestry), which, most notably, has long been used on the cover of H.R. Ellis Davidson's "Gods and Myths of Northern Europe" (Penguin). Ironically, as Lindow informs the reader (see caption, page 251), the consensus that it was intended to portray Odin, Thor, and Frey has been challenged in recent scholarship.