While most modern fonts should be available in a format supported in OS X, you might have a collection or two that may be older types which you might not be sure work on your Mac. If so, then while you can simply try installing them to see if they will work, you might first check to ensure they are fully supported.
The types of fonts Apple fully supports in OS X are the following:
PostScript Type 1
These include Windows and Linux Type 1 fonts, with the extensions .pfa, .pfb, .pfm, and .afm. In addition, Apple supports Adobe Multiple Master fonts.
TrueType fonts (.ttf), collections (.ttc), and suitcases (no extension), are all supported, in addition, Apple’s “.dfont” Mac-specific wrapper for TrueType that places the font’s resource map into the file’s data fork is supported.
This standard, built off of TrueType, is fully supported in OS X and may end in the extension .otf, and possibly .ttf or .ttc.