The 11th house covers the people you choose rather than the ones you're born into: friendship, community, and the causes or hopes pursued alongside a group rather than alone.
It's a succedent house, built from the 5th house's personal creativity and pleasure, and describes what happens when that same spark gets shared with, and sustained by, other people working toward something together.
The 11th house traditionally covers friendships, groups and associations, hopes and wishes, and gains that come through other people rather than through one's own direct effort, historically read as the house of allies, the people who help a goal along rather than share a household or a bloodline.
Friendship carries a particular honesty family ties don't always allow, since it isn't obligatory, a friendship that lasts is lasting because it's actually working for both people. Built from the 5th house's personal pleasure, the 11th house takes that same spark and asks what happens once it's shared and sustained by a group working toward something in common, which can be genuinely nourishing when a group's values line up with a person's own, and corrosive when belonging quietly requires pretending otherwise.