Needs suggestions on my certification -DELL Virtualization and server Storage

Hello Team,

               My name is Rashmi DR worked as Project Management Advisor on Server storage for 1 year @ DELL. Due to my personal reasons taken up break to look after my family.

Also I need to update my skills and technology day by day. Also I need get back to DELL after my break.

Kindly suggest me free courses related to Virtualization and Server storage certifications which are highly preferred @ DELL (FREE / Less Fee -500 USD ). As I have 6 yrs of Coding experience in my previous experience.