RDFa Lite
The RDFa Lite document is a quick 15 minute introduction to the basic markup concepts for RDFa Lite.
Structured data with schema.org codelab
This hands-on, hour-long tutorial introduces you to RDFa and the schema.org vocabulary.
The RDFa Primer
The RDFa Primer is a more involved overview of the full power of RDFa.