The Diablo 2 Wiki archive is available for anyone looking for information on Diablo 2. All information here is pre-D2R but contains a lot of useful information that is still relevant. Updated sections for new D2R features can be found on the PureDiablo Diablo 2 section
TLDR
From Diablo 2 Wiki
General internet slang for forums, TLDR stands for 'Too Long, Didn't Read', implying that the previous poster might (or might not) have a valid point, but failed to write concise (short) enough to invoke interest to reading it.
