For some reason, I don't think you're qualified to teach Japanese to other people. I'm not sure why, though...
More than many things, I think I hate it when people who are obviously new to Japanese make lessons on how to speak the language. I at least have the wherewithal to limit myself to minor corrections when people ask, not making videos and webpages when one can't even write a common word properly.
And for correction, it's "ganbatte" or "gambatte" depending on the romanization you want to use. More correctly, "頑張って."
Finally, I went to your site. Links are broken, and your Korean YouTube videos are all taken down from what I can determine. I looked at your Facebook page and all of your friends have one name. I think you're a large nest of spambots, and not even a real person.
I only send this response to you because others might make the same mistake I did.