Google is just a collection of various other responses to your search criteria. The only time I have ever come even remotely close to the "dangerous" association of runes is when they are used in ordeal work, though that is because of ordeal work's nature and not because of the runes themselves (one needs to take precautions with ordeals anyway, as they are not for everyone).
The above website should be your first stop in learning the runes, as the only "official" meanings they have come from the Rune Poems, which vary between languages and cultures under the Germanic umbrella. Originally, they were the script for some Germanic languages, and were only associated wtih mysteries if one was religous or spiritual (which wasn't uncommon as belief and culture of the Germanic pagans were fairly tied to one another).
Any other interpretation of the Runes are modern and/or personal. If you choose to adopt a set of such associations, be sure it is something that resonates with you. A lot of reconstruction is as much personal as it is honoring traditions (and the tradition of oracular runes has been debated, so I'll leave you with that research on your own).
There are other practices involving runes and other sigils, such as Galdr (sung/vocalized runes), Galdralag (runic verse/poetry), Galdrastafir (sigils not entirely associated with runes, save for similar usage and the fact that they are both in the same culture), bind-runes (combined runes) and drawn runes. The main theme for the rest of these practices is that they are more akin to spell work than divination - a spiritual practiced aimed at manifesting a desire.
All in all, it's no more or less dangerous than any other practice, so long as you don't do anything stupid or act rashly.