End User Training:

Office 365 Training Centre (Teams, Excel, PowerPoint, Access and many more)
https://support.office.com/en-US/office-training-center?WT.mc_id=365AdminCSH

Power BI and Power Platform Training:

Create and use analytics reports with Power BI

https://docs.microsoft.com/en-us/learn/paths/create-use-analytics-reports-power-bi/

Learn the basics of Power BI Desktop, Power Automate, and Power Apps
https://docs.microsoft.com/en-us/learn/paths/power-platform-introduction/

Technical Training:

Azure Technical Courses

Microsoft Certified: Azure Fundamentals (AZ-900)
https://docs.microsoft.com/en-ie/learn/paths/azure-fundamentals/

Microsoft Certified: Azure Administrator Associate (AZ-103/104)
https://docs.microsoft.com/en-us/learn/paths/administer-infrastructure-resources-in-azure/

200USD Free Azure Credit for some hands on experience:
                https://azure.microsoft.com/en-us/free/
                (Do Turn off your VM’s when not using to preserve your credit)

Microsoft 365 Technical Courses:

Learning Paths for Microsoft 365
https://docs.microsoft.com/en-us/learn/browse/?products=m365&resource_type=learning%20path&roles=administrator

If you want to create an environment for some labs on Office 265 you can create a trial as follows:
 https://docs.microsoft.com/en-us/microsoftteams/e1-trial-license

RedHat Courses:

 Free RH024 Online Course - RHEL
Red Hat Enterprise Linux Technical Overview

Free CL010 Online Course - OpenStack
Red Hat OpenStack Technical Overview (CL010)

Free DO080 Online Course - OpenShift
Deploying Containerized Applications Technical Overview (DO080)

Free DO007 Online Course - Ansible
Ansible Essentials: Simplicity in Automation Technical Overview (DO007)

Free DO092 Online Course - Cloud Native Apps
Developing Cloud Native Applications with Microservices Architectures

Free RH018 Online Course - Virtualisation
Virtualization and Infrastructure Migration Technical Overview (RH018)

Free RH053 Online Course - Satellite
Red Hat Satellite Technical Overview