For anyone who loves Sheldon Cooper, Young Sheldon is the place to experience his backstory first-hand. While the show misses the ensemble that the adult counterpart gets to experience, the younger Sheldon's adventures follow his life beginning in high school and transitioning over to college. While Young Sheldon does not perfectly match The Big Bang Theory's initial explanations for Sheldon's past, it still brings a lot of heart and comedy to the characters and storylines.
Whether it be the fantasy elements inspired by Dungeons and Dragons, the reliance on science the central characters must use to save Hawkins, or how the group of main characters trusts each other beyond anyone else, Stranger Things delivers on emphasizing the science fiction and fantasy genres while mixing in a coming-of-age story. The group must constantly save their town from the Upside Down, especially when Vecna's arrival threatens the townspeople in addition to the central characters.
Given how often The Big Bang Theory directly references Star Trek, it makes absolute sense to watch the show that inspired so many references. Star Trek is a pure science fiction fantasy show with various spinoffs. Star Trek offers a different look at humanity's future, and although the series has plenty of comparisons to Star Wars, the two franchises have plenty of differences in their presentation. The Big Bang Theory even featured multiple guest star appearances from the cast of the show.
Friends is another series that shares the chosen family dynamic, there is no one more important in Rachel, Monica, Phoebe, Joey, Ross, and Chandler's lives than each other. They depend on each other for light-hearted and emotional moments. They watch each other's ups and downs. They are present for each other's weddings and childbirths. There is no moment small enough for the gang to gather together, and the mix of personalities and romances that exist within the group keeps things funny and interesting.