You might already know about Underscores, often abbreviated as _s, which is a popular starter theme for WordPress. This is a big project maintained by
How to create a theme with underscores (_s) - Speaker Deck
Underscores Website Templates
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A walk-through tutorial on using Create Block Theme plugin
A walk-through tutorial on using Create Block Theme plugin
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Your own Wordpress theme - create a theme with underscore.me
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WordPress Theme Development: Getting Started with Underscores (_s
WordPress Theme Development: Getting Started with Underscores (_s
Underscores – IncludeWP