There are good introductory courses on coursera.org, edx.org and KhanAcademy. The most notables are CS50 from Harvard (https://cs50.harvard.edu https://cs50.har

There are good introductory courses on coursera.org, edx.org and KhanAcademy. The most notables are CS50 from Harvard (https://cs50.harvard.edu https://cs50.harvard.edu) and "The Beauty and Joy of Computing" from Berkeley (https://bjc.berkeley.edu https://bjc.berkeley.edu).