Across any market area (eg: mineral resources) there are thousands of documents released daily across multiple exchanges (via EDGAR, SEDAR, etc) ranging from two line advisories, to 4,000 page technical reports on projects | acquisitions, alongside the usual quarterly | yearly annual reports, etc.
There's plenty to do parsing common forms for generic changes (board members, board member share changes, etc) and market regime specifics (exploration property aquisition) and trends (series of related aquisitions) for those that like the weeds.
Some might argue that 'understanding' these patterns lead the changes in stock price movements, and give insight wrt weathering short term changes for longer term returns.