If your aim is to learn the Talend MDM in a structured way, my recommendation will be to take the following trainings. It will provide necessary VMs with datasets so that you can practice seamlessly.
Talend named a Leader.
Kickstart your first data integration and ETL projects.
Watch the recorded webinar!
Accelerate your data lake projects with an agile approach
Create systems and workflow to manage clean data ingestion and data transformation.
Introduction to Talend Open Studio for Data Integration.