General

• TED-Ed ​YouTube Playlist: Creative Writing Advice (brainstorming techniques, genre-specific advice & beyond)
  
• Literary Devices: Searchable Glossary
  
• Joe Fassler: LitHub

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Poetry

• Button Poetry: YouTube
  
• Poetry Foundation: Twenty-Two Poem Hacks
  
• Poets.org: Poetry for Teens
• Rainer Maria Rilke: "​Letters to a Young Poet"
  

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Prose

• Underlined
• One Teen Story
• NaNoWriMo
• For teenagers submitting works of prose (fiction & creative nonfiction), Sandpiper offers free, individualized feedback. Click here to submit.

Please feel free to email Sandpiper if you would like to add something to this list!