I've been going through some good (seeming) resources for Rails tutorials, and will dutifully follow the steps until halfway through I realize a helper has been dropped or something else has changed. Aside from the 1.0->2.0 change (which I imagine was significant, given typical versioning), are there other updates that have fundamentally changed how rails works, and before which I shouldn't try to "translate" older resources? Thanks!
(please don't just say "read the changelog". I don't know how Rails works; it doesn't mean much to me yet)