Here is a list of online platforms that will help you learn topics that interest you (with a certificate, of course). The link redirects to a page having information about these courses, known as MOOCs – Massive Open Online Courses. I have been enjoying such courses since 2008…!
Some of the most popular platforms for general subjects/ topics are, Coursera (free/commercial), FutureLearn (free/commercial), OpenLearning, Stanford online and edX. These sites offer courses from best of the universities and learned faculty members across the globe.
Want to learn engineering software with a wide-range of choice for learning? Check out Bentley’s Student server. One may learn through demonstrating video and go for self-learning by installing and performing hands-on practice.