The AV Toolkit is for users who want to practice their skills at audio and video editing.
Audio editing:
AUDACITY: http://www.audacityteam.org/
LMMS: https://lmms.io/
Video Editing:
KDENLIVE: http://kdenlive.org/
OPENSHOT: http://openshot.org/
FLOWBLADE: https://jliljebl.github.io/flowblade/
SHOTCUT: http://shotcut.org/