Many definitions describe online learning as learning or education that is delivered via the internet or personal computer. However, your online learning experience can be much more.
Each of these are variants of online learning offering different levels of interactivity from pointing and clicking, or viewing videos, to hands-on experimentation:
web-based multimedia courseware including videos, podcasts, etc.
Mobile learning or m-learning
includes tablet or mobile performance support, apps, audiocasts, e-books, etc.
Video conferencing or telepresence
online lectures, webcasts, webinars, tutorials, etc.
Web or browser-based virtual worlds, serious games, and simulations
Massively Open Online Courses (MOOC)
Virtual reality and augmented reality
experiential learning or on-the-job performance support
This blog post from e-learning Industry is a very quick read and lists 5 advantages to basic online learning: 1) ability to learn practically whatever you want, 2) comfort and convenience, 3) enhanced professional skills with certificate training, 4) self-paced learning, and 5) low cost or free when you audit. For example, review Class Central's guide on How to Sign up for Coursera Courses for Free.
You can get started by entering your area of interest in the search field of the suggested sites below: