1 There are many teachers who will answer your questions. Others will also answer and generally will indicate that they are not teachers.
2 This is a public forum. You may find someone who will do that, but most people respond to public questions. Here, people engage in public discussions and answer questions out of interest and create an online community. If you want a private individual teacher, then maybe you should go to a site where you can engage private teachers, though that sort of service will obviously not be free.
3 Full company details are available in the About section.