honestly it's worth it to support creators rather than chasing sketchy mirror sites. A good place to start is official publisher platforms: Shueisha's Manga Plus and VIZ Media's site/app both offer tons of chapters legally, often with simulpubs—meaning you can read the newest chapters as they come out. Kodansha now runs the K Manga app and also sells volumes through BookWalker and Amazon Kindle. For older series, ComiXology and BookWalker routinely have sales where you can grab volumes at a discount.
If you were thinking of a particular title like 'Kiss Him, Not Me' or similar, search for the English license — sometimes the rights are held by different companies in different regions, so a title might be on one platform but not another. Don’t forget free library lending apps like Libby/OverDrive or Hoopla; I’ve borrowed whole runs that way. Subscriptions like VIZ’s Shonen Jump or Mangamo are cheap and let you binge legally, and Crunchyroll Manga has a selection tied to anime licenses. Supporting these channels keeps creators paid and the industry healthy — and you get high-quality translations without malware risks. I always sleep better knowing my manga habit helps the creators I love.