Collections
Where your links live once they leave the inbox.
A collection is a named group of links, the way a folder holds files. Lark files every new save into a collection for you, so your library is organised from the first link; you only step in when you want something arranged differently.
Nesting and folders
Collections can hold folders, so a broad topic can be split into smaller ones without creating a long flat list. Rename, reorder, or merge them as your interests change. Moving a link between collections is a single action from the link itself.
Tags versus collections
A link lives in exactly one collection but can carry many tags. Use collections for the big shape of your library and tags for the details that cut across it. Both are searchable, and Lark suggests tags for every save so you rarely have to type them yourself.