Best book on 1…e5 for Black: https://chessreads.com/review/opening-repertoire-the-open-games-with-black/
Practice the e5 repertoire: https://app.noctie.ai/repertoires/3e41b275-aa7d-4c22-ba25-2cefecddd9d5?aff=q9yKD
e5 repertoire PGN available here: https://www.patreon.com/posts/1-e5-repertoire-144890020?
A full 1.e4 e5 repertoire for black covering the Spanish, Italian, Scotch, Vienna, King’s Gambit, Center Game, Three Knights, and the Bishop’s Opening.
Here are the separate playlists on each major 1.e4 e5 opening
Spanish Game: https://www.youtube.com/playlist?list=PLssNbVBYrGcC8gwt8Q-dIJ_bBKihu8sT7
Italian Game: https://www.youtube.com/playlist?list=PLssNbVBYrGcDtaEsaYMUyiAmK64nd4A5H
Scotch Game: https://www.youtube.com/playlist?list=PLssNbVBYrGcBctwKwnUP9YjDZv7OfiOm5
Vienna Game: https://www.youtube.com/playlist?list=PLssNbVBYrGcBHQPIPXaJ_dpQ_KXz7_zdD
King’s Gambit: https://www.youtube.com/playlist?list=PLssNbVBYrGcCauRoeKm0mUiNP9MzMzAVn
Ponziani: https://youtu.be/zoCfGnNjlbo
Game collections I’ve mentioned:
https://chessreads.com/review/chess-warrior-the-life-games-of-geza-maroczy/
https://chessreads.com/review/the-life-and-games-of-vasily-smyslov-volume-1-the-early-years-1921-1948/
https://chessreads.com/review/my-best-games-of-chess-1908-1937/ by Alekhine
If you decide to upgrade to Premium on https://noctie.ai/?aff=q9yKD, use the code HANGINGPAWNS to get a 64% discount, or the code HPYEAR for 20% off the (already discounted) yearly membership.