Please explain some point

Hello! 

I have simples questions to better understand how things works.

1- Can i please have short explaination of the role of the differents listed below (1.1 to 1.7)?

VIDEO FONCTIONALITY

In "Video Upload Type" Section

1.1- Video Is Premium : Yes or No

1.2- Video Is Title : Yes or No

1.3- Vidéo Is Download : Yes or No

In "Description" Section 

1.4- Video Is Rent : Yes or No

1.5- Video Is Comment : Yes or No

1.6- Video Is Like : Yes or No

1.7- Video Price List

2- What is "Subtitle Type" and how it's work?

3- How do you manage a video with different audio languages (for example, a film with audio in French, English and Hindi)?

Best Regards