Straight out of Silicon Valley, Udacity is one of the original online course providers, pre-dating both EdX and Coursera, and was the first institution to roll out 'nano-degrees'.
These are brief and affordable programmes aimed at teaching workers the skills required to hold an entry-level position in a data- or tech-related function at a multinational company.
Fields taught include AI, business analytics, digital marketing and programming and development across several platforms.
It also hosts around 200 free courses for enthusiasts to take at their discretion.
Early participation in such a programme can set a foundation stone for further studies within the fields of Computer Science and Data Science.
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Although a wealth of content is offered freely, note that most paid programmes will cost upwards of EUR 500, and sometimes well beyond.
While Udacity can serve as a student's first point of contact with a subject, a great deal, if not most, of Udacity's courses will be aimed at a more experienced audience.
Udacity recommends a weekly dedication of 10 hours to whatever course is followed.
Simple online registration process