The Poetry Foundation: Sylvia Plath
https://www.poetryfoundation.org/poets/sylvia-plath
Includes a bio, poems, and articles about Sylvia Plath
Genius
https://genius.com/artists/Sylvia-plath
Sylvia Plath poems annotated for understanding by other readers
https://open.spotify.com/user/spotify/playlist/37i9dQZF1DX2G2VrXHSPQG
Recordings of Sylvia Plath reading her poems