Introduction of presets across padding, margin and block gap – Make WordPress Core

The introduction of pre-set sizes to be shared across padding, margin and block gap in WordPress 6.1.

Everything you need to know about spacing in block themes – WordPress Developer Blog

Cannot remove blockGap margin-top from full/wide blocks · Issue #37811 · WordPress/gutenberg · GitHub

WordPress】 受託開発におけるハイブリッドテーマ開発 #WordPress - Qiita

Theme.json layout and spacing options - Full Site Editing

Spacing – Theme Handbook

How the Style Engine Generates Classes

Define Container Layout » Elementor

How to Change Margins in WordPress for Better Web Design

WordPress 5.9 Comes with Block-based Default Theme

Spacing – Theme Handbook