[ubuntu] going from mac to ubuntu, need basic help

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http://ubuntuforums.org – I've been using a mac for a long time, and I've currently switched to Ubuntu, as my old macs have been obsolete for a while now. I'm working on an old Dell, and do not appear to have hardware issues. The help I need is more basic than that. Is there a tutorial for Mac to Ubuntu ? Things I'm sure are simple, but just don't know to look for, like is there an equivalent to "applications folder" in Ubuntu ? Doing just fine with most things, but simple stuff like this is slowing me down. I don't know what, or how many applications are on this computer. I have found some because the soft (Hardware)