Part 1? of a handful of quick tips for Gimp 3.0.0; https://www.gimp.org/downloads/
Timestamps:
00:00 Intro
00:38 Transparency / Alpha
01:25 Encoding
01:48 Smooth brush stroke
02:05 Straight lines
02:15 Keyboard shortcuts
02:40 Saving tool presets
02:57 Gradients
03:43 Move vs unified transform tool differences
05:04 Horizontal/vertical flip view
05:24 Dodge burn
06:03 Setting guides & snapping
06:44 Selection (magic wand)
07:36 Windows and arrangement
08:00 Setting preferences for tools and windows
Wallpaper is a painting by Karl Friedrich Schinkel called Landschaft mit Pilger.