Netflix, Hulu, Amazon, and YouTube are the most popular sites for streaming TV episodes, though you might need to subscribe to get the best stuff.
You can easily do this on Firestick. I personally switched to it after cutting the cord. There is a great number of Kodi builds and apps, both free and paid ones, that allow watching everything you want. Even if you installed a build and don't like it, it is easy to uninstall it (here is a good guide https://www.firesticktricks.com/uninstall-kodi-build-on-firestick.html) and choose another one. I watch and rewatch movies and TV shows this way.
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