User friendly list of terminal commands?

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http://askubuntu.com – I've been using my terminal more and more lately, and I'm wondering: is there a list of terminal commands somewhere? Perhaps one that is organized / collapsable like      apt-get           install           remove etc..etc..etc.. If there is a list but not one so conveniently created, any recommendations on how I could create such an easily accessible command list? (i.e. html tables or something????). Thanks in advance. (HowTos)