diego.blogger.de

Did you ever do an index for a book?
If not then these might be helpful:

Indexes a chapter from The Chicago Manual of Style
wikibooks indexing

Most important are probably these usages:
        \index{hello}
        \index{hello!Peter}
        \index{Jenny|textbf}
        \index{Quantum Mechanics|(}
        \index{Quantum Mechanics|)}
        \index{pdf|see{probability density function}}

It is advisable to use singular terms, except e.g. "correlations".
And only to index established appreviations, otherwise to use see-reference.