Black Widow is the 2021 film
Choose its individual movie page for the synopsis, cast and running time. The Avengers entries are separate productions, even when they share characters. Scarlett Johansson cast search is another way to find the film if you forget its title.
Loki is a series with seasons
Use TV Shows, then open Loki and check the season you want. A manual checkpoint can preserve your last completed episode between evenings. Confirm the same season in the selected viewing service.
Continue through the characters or the mood
For more Avengers-related films, use the Black Widow collection. If Loki's unfamiliar rules are what interest you, compare Severance, Silo or Dark in the strange-worlds collection. They offer different stories rather than more chapters about the same characters.