latex2e-reference – A reference for LaTeX in HTML
The HTML hyper-document provides a thorough (though slightly dated) discussion of LaTeX 2e.
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LaTeX reference documents
Maybe you are interested in the following packages as well.
- cleveref: Intelligent cross-referencing
- saferef: Safer references through strong typing of references
- totpages: Count pages in a document, and report last page number
- showlabels: Show label commands in the margin