Quick answer
KeepNest categories belong to its local library; they are not X bookmark folders. Use broad subjects to collect related references, then choose processing instructions by what you need to reuse. This keeps an interest-based collection useful without promising to reorganize your X account.
Make one useful category first
Start with a topic such as product research. Give it a concrete instruction: preserve the user problem, method and evidence. Browse fresh posts, inspect a few actual saves and search for a phrase you remember. Add categories only when they help a recurring task; an uncertain item can remain unsorted without losing its original.
