Does anyone teach me English? I can teach you Chinese

In the sentence "Can you check the extra cost of adding webinar functionality ?". Should I say "webinar functionality" or "the webinar functionality"? If both are correct, what is the difference in the conveyed meaning?

Are you having a hard time using “its” and “it’s”? If yes, try this quiz to test your knowledge.

Complete the sentence.

Please, explain the difference between: 可是, 但是, 不过, 但却.

What is the meaning of "fly" in hindi? A) उड़ना B) चलना C) भागना

I want to be a teacher

Choose the correct answer.