IBM DB2 Courses

Getting Started with Data Warehousing and BI Analytics
IBM via Coursera

Data Engineering Capstone Project
IBM via Coursera

Db2 em z/OS
YouTube

Mainframe: Code DB2 on COBOL Programs for Absolute Beginners
Udemy

Learn Basic DB2 on Mainframe for Beginners
Udemy

Database Engineer/DBA - (PostgreSQL, IBM-DB2, MariaDB,NoSQL)
Udemy

Relational Database Basics
IBM via edX

DB2 Tutorials
Caleb Curry via YouTube