The Sims 2 FAQ

Where to find CC:
http://trappingcrushes.tumblr.com/
http://simscave.mustbedestroyed.org/index.php?board=152.0
http://digitalperversion.net/gardenofshadows/index.php
http://modthesims.info/browse.php?gs=1
http://www.moreawesomethanyou.com/smf/index.php/board,5.0.html
http://sims2defaults.dreamwidth.org/ (Default replacements for Maxis clothes, hair, etc to save performance & better looking townies.)

How to install CC and other help:
http://modthesims.info/wiki.php?title=Game_Help:Custom_Content

Fixing common issues:
https://www.reddit.com/r/thesims/comments/2bkpn3/so_you_probably_got_the_sims_2_ultimate_heres_a/
http://www.parsimonious.org/support/sims2-game-crashes-and-problems.html

What is an "Uberhood"?:
Sims Uberhood allows you to pick which default neighborhood(even down town!) is going to be your main hood and then allows you to pick any other hood(s) as your sub-hoods.

Uberhood links:
http://meetme2theriver.livejournal.com/63030.html
http://www.modthesims.info/download.php?t=301194

CC creation tutorials:
http://poppet-sims.tumblr.com/dds
http://modthesims.info/t/150742
http://poppet-sims.tumblr.com/post/54039893647

Hair texture resources:
http://poppet-sims.tumblr.com/post/87034214028
http://poppet-sims.tumblr.com/post/90758589118
http://remisims.livejournal.com/85726.html
http://pooklet.tumblr.com/post/80642466956/project-mayhem-collectors-edition-all-textures
http://lilith-sims.tumblr.com/post/55372572348/lilith-sims-a-lot-of-people-have-asked-me-to

Misc textures:
http://goatsattic.dreamwidth.org/6300.html
http://shastakiss.livejournal.com/21649.html
http://curiousb.livejournal.com/43980.html
http://hafiseazale.livejournal.com/1131.html

Color actions:
http://digitalperversion.net/gardenofshadows/index.php?topic=29058.0

General tips:
- Check "resources" pages, "WCIF" (where can I find?) pages, etc.
- Check tags on Tumblr: sims 2 download, s2cc, ts2cc
- Often people might have links to "CC finds" blogs, these are always a great resource.
- Google! Or ask the thread.