Whether you are starting out playing 1…e5 for Black or have been playing for a while and often find lines that you are uncomfortable with, I think you’ll really like this video series on the ChessExplained YouTube channel. He has a playlist with 8 videos on a repertoire for Black’s 1…e5.
In the videos, he tries to give solid, playable lines for Black where you have chances to equalize without getting into too many quick tactical battles. These aren’t always necessarily the “best” moves for Black, but they are fully playable at the highest level and will help you get positions where you can consistently last into the middle game and just play chess.
Of course, some of White’s openings are particularly provocative (e.g., King’s Gambit, Ponziani), so you will often end up in sharp positions anyway. But he gives you some easy-to-remember ways to combat most of White’s aggressive tries. As is the case with most opening theory videos that I watch online, I find that I have to watch them multiple times, then play some, then return to them again. Usually after trying some lines and failing to remember some key ideas (and getting smoked!), then when I return to the videos it’s easier to remember the patterns because they make more sense to my brain (because I’ve seen them in action in my own games).
Although I have played around with other responses with Black, I keep coming back to 1…e5 because I feel that I get consistently better games than with other openings. At some point maybe I’ll switch to something else to learn more ideas, but for now I still have plenty of work to do learning the patterns, plans, and ideas in the e4 e5 games.
One quick note is that the playlist does not include the Ruy Lopez, probably because that in and of itself requires several video series. But if you want to see some ideas for playing Black in the Ruy you can do a search for live blitz games on the channel and on other channels online.