Syncing data from BigQuery to Salesforce can be achieved through three separate methods: Data Loader, Data Import Wizard, and Reverse ETL with Census. Each method has its own prerequisites, advantages, and limitations. Data Loader allows importing up to 5 million records at a time, while Data Import Wizard is suitable for smaller imports and requires working knowledge of Python. Reverse ETL with Census, on the other hand, enables syncing larger quantities of data faster and more reliably, making it ideal for automated and regular syncs. By choosing the right method based on their specific needs, users can efficiently move data from BigQuery to Salesforce.