In so many ways we are all 'lifelong learners' ... after all, life itself continually throws learning challenges our way.
But for those who would like a more formal approach, the following resources might be of interest. After all, we're sure all our Starlink readers have hours to spare for self-education, particularly over the summer holidays here ... Hmmm ... ok, so that's a total furphy! :) But you may find a course to tempt you anyway ...
All offer courses at no charge across a wide range of disciplines, at varying levels of complexity, and either time-specific or self-paced. While these courses won't give you a formal qualification, they are rich sources of new learning.
Coursera is the most comprehensive site we've found. It "is an education platform that partners with top universities and organizations worldwide, to offer courses online for anyone to take. " It has 881 courses (in various languages), 116 partners and over 10.5 million users.
Open Universities Australia Open2Study website has a small number of courses (48 at time of writing) available at no charge. However these do seem primarily to be designed as 'tasters' for more comprehensive courses available - which do attract fees. All their no-cost options are four weeks in duration and we found only two that were open at any time and self-paced. The others all start on 5 January, so essentially an equivalent of 'summer school' for Australians.
Academic Earth has "curated links to over 750 online courses and 8,500 individual online lectures, giving students of all ages unparalleled access to college courses they may otherwise never experience. Whether supplementing existing coursework, or learning for the sake of learning, anyone with an internet connection has the freedom to learn at their own pace from world-renowned experts, without the burden of rising tuition costs".
MIT OpenCourseWare (OCW) is "a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity." You can find complete materials for over two thousand courses online here.
EdX offers "interactive online classes and MOOCs from the world’s best universities, colleges and organizations. Online courses from MITx, HarvardX, BerkeleyX, UTx and many other universities".