We currently have these 4 tutorials for Godot and TexturePacker.Tutorials for other frameworks are available from the tutorials list.
Godot 3: How to create sprite sheets the easy way
Video tutorial: How to create sprite sheets for Godot 3 using TexturePacker.
Godot 3: How to create tile sets the easy way
Video tutorial (1:50): How to create tile sets in seconds for Godot 3 using TexturePacker.
These are more general tutorials with information about sprites, sprite sheets, performance and rendering quality:
How to create a sprite sheet
This tutorial explains the most used sprite sheet types and how you can easily create a sprite sheet from a single of images. Links to free software included.
Packing normal maps into sprite sheets
Tutorial: Create sprite sheets for your normal mapped sprites.