Smiling friends is useful for English practice if you can already follow natural conversations. Some conversations move quickly, so learners may need to listen to certain parts more than once at first. The vocabulary is not overly technical, though it includes enough variety to make the practice meaningful. Also, animated scenes often make the context easier to follow through visual clues. Some parts may require more focus, but the main story remains easy to follow. For learners around B2/C1, English subtitles can make the first watch more manageable.
