https://roots.io/bedrock/docs/bedrock-with-ddev/

ddev config
project_name
web
wordpress

ddev start

rm .DS_Store
ddev composer create-project roots/bedrock

setup .env
DB_NAME='db'
DB_USER='db'
DB_PASSWORD='db'
DB_HOST='db'
WP_ENV='development'
WP_HOME="${DDEV_PRIMARY_URL}"
WP_SITEURL="${DDEV_PRIMARY_URL}/wp"
https://roots.io/salts.html

ddev ssh
cd web/app/themes
composer create-project roots/sage THEME_NAME
cd THEME_NAME && npm install && npm run build