"Hello, This is" vs "My Name is" or "I am" in self introduction
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What is a very general term or phrase for a course that is not online?
This Google search shows many examples of face-to-face being used to describe classes traditional classroom courses that are not online. Another term used in educational circles nowadays is blended learning. A blended course meets face-to-face but is supplemented with online components.

What is the difference among "Sign up", "Sign in" and "Log in"?
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"join" vs "join in" - English Language Learners Stack Exchange
Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

what is the difference between on, in or at a meeting?
You've rightly called out the differences between the first two statements: He is in a meeting . The above statement refers to the person attending a meeting in the same premises (i.e. on site).

What does ' (something) goes brrr' mean and how to use it?
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"I have submitted the application" is it a right sentence?
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word usage - English Language Learners Stack Exchange
Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

How to inform the link of a scheduled online meeting in formal emails ...
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phrase usage - "I would like to inform you" vs "This is to inform you ...
Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.