As a VMware Certified Instructor, I am still running a lot of VMware vSphere 6.5 courses.
Even though we now have VMware vSphere 6.7, 6.5 is still proving a popular choice, and with that in mind, it may be worth having a look at the following ebook.
UPGRADING TO VMWARE VSPHERE 6.5 - Insights for vSphere administrators
The book is only 32 pages long and breaks the upgrade into 3 phases
- Phase 1: Pre-Upgrade
- Phase 2: Upgrade
- Phase 3: Post-Upgrade
The book also has links off to various other useful documents.
Thanks to Emad Younis for his time in authoring this book.