This lesson covers the initial step of adding a custom block category by defining it in block.json. You’ll add a category entry with your desired name (like “block development mastery”) to the block configuration.
The lesson explains that referencing a non-existent category will cause errors until properly registered in PHP. You’ll learn about WordPress’s default block categories (text, media, design, widgets, theme, embed) and understand why you shouldn’t use the deprecated “reusable” category since it now appears under patterns.
This foundational step prepares your blocks for proper categorization in the block inserter interface.