Getting started with captions and transcripts
How to create captions and subtitles on YouTube
Viewing videos with captions
Guru (channel type)
A Guru account is an account type which you might want to select if you enjoy making videos which teach people a certain skill or explain how to do something. Like the other special account types, Guru accounts have extended performer information profiles. To change your channel to hold Guru status, go to your Account page, click on Edit Channel(under “More”), and click the “change channel type” link at the bottom of the page.
More info on different Account Types