CMSSW related important links - rsehgal/TrackingMod GitHub Wiki
First and foremost the documentation
http://cms-sw.github.io
Forking the CMSSW repo
https://github.com/cms-sw/cmssw/fork
Skeleton Code Generator
https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideSkeletonCodeGenerator
Firework geometry viewer
https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookFireworksGeometry
Getting CMSSHOW
wget http://cmsshow.web.cern.ch/cmsshow/cmsShow-10.0.linux.tar.gz
Twiki for Geometry Description
https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideDetectorDescription
Migration from DD to DD4Hep
https://twiki.cern.ch/twiki/bin/view/CMSPublic/DDtoDD4HepMigration
Twiki for Magnetic Field
https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideMagneticField
Adding my own executable in cmssw
https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideBuildFile#BuildFileFlagsTestRunnerArg
A lot of good stuff, May be useful for beginners like me
http://zitogiuseppe.com/oldf/guide.html
CMS WorkBook
https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookComputingConcepts
http://home.fnal.gov/~duong/Miscellaneous/cms_instructions.html