5-10 years ago the Audacity versions (1.x.x) were old; now the latest version is 2.2.0.
I use Audacity mainly for sound recording and audio converting, but I seldom edit the sounds. I don't know how much you need to use Audacity on your sounds/audio files after your 5-10 years ago, so I suggest that you might want to consult their 2.2.0 online documentation here
: http://manual.audacityteam.org/index.html#using