Using QGIS 3.12 and covering "ALL" settings and aspects of QGIS labeling, in the map canvas.
Some parts is really basic, and others are quite advanced.
It's a really long video and I don't rush anything, so some of you will certainly consider it "slow".

Timestamps:
18:55 Text
27:53 Formatting
35:52 Buffer
39:12 Mask
42:46 Background
48:22 Shadow
52:45 Callouts
56:53 Placement
1:12:11 Render