If you need the courses documented, then I would also suggest online college courses. If you just want the skills, then there are even more online resources, which you likely would be able to move through fairly quickly. Check out sites like EdX. They have many of the types of courses you are considering, and can provide varying levels of documentation, if you need certificates or even degrees in specific skills, with content provided by some substantive universities, like MIT and Harvard.

...pronounced like the long vowel and first letter of the alphabet...