List the best courses present in the internet for different languages

[littleironical]

Till now we only have C++ and Java course, but we need more courses like:
(If you find a better course for Java, you can comment that here)

1. C
2. Python
3. Go
4. C#
5. R
6. JavaScript
7. PHP
8. Swift

So, the work is to find the best available Free course for the above listed languages.
If you get anyone of them, that's also ok, comment that below and I'll assign you to add the title & links in the code.