Introduction | Installation | Basic Usage | Fetching Researcher Information | Employment and Education History | Research Outputs | Professional Activities | Efficient Data Retrieval | Fetching Complete Records | Getting All Activities in One Call | Batch Processing Multiple ORCIDs | Searching the ORCID Registry | Basic Search | Advanced Search with Solr Queries | Search by DOI | Data Analysis Examples | Publication Trends Over Time | Collaboration Networks | Funding Analysis | Authentication (Optional) | When You Need Authentication | Setting Up Authentication (If Needed) | Using Authentication | API Status and Error Handling | Checking API Health | Handling Errors | Best Practices | Rate Limiting | Caching Results | Working with data.table | Additional Resources | Summary