We maintain tutorials and training material for Invenio v3 in a separate repository:
https://github.com/inveniosoftware/training
Prerequisites
Tutorial 01 - Getting started
Tutorial 02 - Tour of Invenio
Tutorial 03 - Infrastructure overview
Tutorial 04 - Running Invenio
Tutorial 05 - Customizing the look and feel
Tutorial 06 - Developing with Invenio
Tutorial 07 - Adding a new field
Tutorial 08 - From scratch
Tutorial 09 - Build a simple deposit form
Tutorial 10 - Modify records before indexing
Tutorial 11 - Linking records
Tutorial 12 - Managing access
Tutorial 13 - Securing your instance
Tutorial 14 - Deployment and monitoring
Tutorial 15 - Application architecture
Invenio Digital Library Framework.