Act as a seasoned SEO content writer with 5+ years of experience in podcast marketing. Craft a detailed, actionable guide on how to optimize a podcast for Google's Podcast Search. Cover key areas such as [metadata optimization], [transcript inclusion], and [engagement metrics]. Explain the importance of [keyword research] for podcast titles and descriptions, and provide step-by-step instructions on [submitting to Google Podcasts]. Include best practices for [episode structuring] and [backlink building] to improve visibility. Tailor the advice for [beginners] or [advanced users], depending on the audience's expertise level. Use clear examples and avoid jargon unless defined.