[Tex/LaTex] What are TeXLive’s four different texmf folders

folderstexlivetexmf

Could someone please explain to me what the purpose of the four different texmf folders are in Mac? E.g. there is:

1. /usr/local/texlive/2011/texmf
2. /usr/local/texlive/2011/texmf-config
3. /usr/local/texlive/2011/texmf-dist
4. /usr/local/texlive/2011/texmf-var

Also, when installing fonts and packages, do I place them in /texmf or /texmf-dist?

OK, given the helpful comments to your query, here's a discussion of how the various texmf folders map into the "official" nomenclature of the TeXLive tree (set in all-caps):
Separately, if you have a LOCALTEXMF directory tree, TeXLive expects to find it at /usr/local/texlive/texmf-local, unless you edit the configuration file /usr/local/texlive/year /texmf.cnf and provide an alternate location. If you do so, be sure to run texhash to update the filename database.