Just be yourself. You're also keen to learn, which is great. Admit you don't know the terminology, that technical answers should be pared down so you don't need to be a linguist in order to understand, and if the question is interesting, it won't matter if grammar terms are thin on the ground. Eventually, you'll keep hearing the same terms used again and again and they will stick.

Include your research, or your gut feelings as a native speaker, show you have spent time thinking it through. Be cheerful. Be hopeful, but don't be upset if your question doesn't receive a standing ovation. It probably won't.

Here's but one example of a non-expert asking a grammar question.

What's wrong with "I'll open you the door"?

Always a good idea to ask users to supply examples, and/or links in their answers.

Just be yourself. You're also keen to learn, which is great. Admit you don't know the terminology, that technical answers should be pared down so you don't need to be a linguist in order to understand, and if the question is interesting, it won't matter if grammar terms are thin on the ground. Eventually, you'll keep hearing the same terms used again and again and they will stick.

Include your research, or your gut feelings as a native speaker, show you have spent time thinking it through. Be cheerful. Be hopeful, but don't be upset if your question doesn't receive a standing ovation. It probably won't.

Here's but one example of a non-expert asking a grammar question.

What's wrong with "I'll open you the door"?

and here's another question asked by an EFL teacher but it is simple to understand, hopefully, you already know what an adjective, noun, verb, and infinitive phrase is.

Why does "I was happy to do my homework" work, but "I was tired to do my homework" doesn't?

Always a good idea to ask users to supply examples, and/or links in their answers.