Substack SEO Foundation Builder

Substack-specific SEO setup based on 2026 best practices: custom domain decision (custom domains build SEO equity that travels with you/substack.com URLs share the domain's reputation with every other publication)/post title optimization with searched keywords/URL slug editing (Substack auto-generates often-bad slugs — edit them)/subtitle as meta description/always-include-cover-image for OpenGraph and Google Discover/Sections for content organization that Google indexes; outputs configuration checklist