Internet Shakespeare Editions: Henry V
http://internetshakespeare.uvic.ca/Library/Texts/H5/
The Internet Shakespeare Edition is a reliable source for digital texts of Shakespeare's plays. The site also features well-researched and annotated critical resources.
No Fear Shakespeare: Henry V
http://nfs.sparknotes.com/henryv/
A useful resources for those who want some help parsing Shakespeare's language. Features Shakespeare's text alongside translations into modern English.
Poetry Foundation: Glossary of Poetic Terms
https://www.poetryfoundation.org/learn/glossary-terms
A comprehensive of poetic terms and devices. Given the highly rhetorical style in Henry V, this can be...