Since the lock-downs with COVID-19 started, Amateur Radio testing has been unavailable as it's on-site only. HamStudy.org has stepped up, enabled remote testing and is now online.
edX.org offers free college-level courses and learning online. In the sprit of a previous post about Coursera, edX offers more of a technical-based learning catalog from many of the premier technically recognized universities.
VLADAN blog site contains various instructional posts regarding VMware-based infrastructures. Also contains great free study guides for certifications and links to valuable free tools for your toolbox.