How can I develop or view codes made in C#,C++, Python,Java, JavaScript and Ruby?

Answer 1

to developed code you can use most text editors. an IDE is good for writing code and saving it as a project. the IDE will help you to debug and compile/run your code too

Answer 2

Reffering to which IDE?

Answer 3

you will most likely need a separate IDE for each language as not many IDEs work with every language