As I'm quite newbie to this field, I've doubts and there are some I couldn't find on Google, i.e:

If I'm not wrong, index.html makes it possible to avoid to add the filename to the url, www.example.com/ is equal to www.example.com/index.html. And that works for the following subdirectories, right? www.example.com/music/

• Is there any other way to achieve this without using an index.html file? (I've read smth about converting dynamic urls to static: ./?var1=value1&varN=valueN -> ./value1/valueN)

• How can I convert www.example.com/music/ to music.example.com/ and why should it be used?

Thanks in advance!