List the best courses present in the internet for different languages

Till now we only have C++ course, but we need more courses like:

Java
C
Python
Go
C#
R
JavaScript
PHP
Swift
So, the work is to find the best available Free course for the above-listed languages.
If you get any one of them, that's also ok, comment that below and I'll assign you to add the title & links in the code.

Locate the existing C++ course entry and review how its title and link are represented in the project. Find free courses for one or more listed languages, then add their titles and links using the existing entry format; done means the new courses appear in the course list.

Written by the indexing model from the issue text.