Yeah, Audacity ias a multi-track editor; I think Wavepad is supposed to be simpler and more comprable to something like Goldwave (except perhaps not even as feature-rich as that). If you want true project-style editing you need something like the other programmes you mentioned and have a bit of experience with..Reaper, Cubase, or, indeed, Audacity, though people I know who have more audio editing experience say it’s not the greatest thing to work with (slow and clunky, mostly).

But, of course, Audacity is free.