Forum:Introduction pages

I think there should be more introduction pages. There are only three by now. For newcomer-friendliness, introduction pages that is easier to grasp are required.

I'm a newcomer, and I joined at the end of September. Up arrow notation is fine, and linear array notations are, too. But some pages like Ordinal Collapsing Function or fundamental sequences (is there even a pages for it?) doesn't gives out enough examples.

my concept about fundamental sequences and Ordinal Collapsing Function beyond BH Ordinal is still vogue, please help me out.