ありがとうございます
It seems I need to review my particles :)

Here's some more explanation. When we use verbs of being in Japanese, we use the に particle. It's easier for me to memorize the verbs with the particle instead of figuring out which verbs are verbs of being. For example, 〜にいる / 〜にいます、〜にある / 〜にあります、〜に泊まる / 〜に泊まります. These are probably the most common verbs of being which *always* use the 〜に particle.

Here's another verb where I found memorization easier than figuring out which particle to use.

- 誰に会います
→ if someone is going to meet someone, we use the 〜に particle after the person who is being met.

- どこで会います
→ if someone is meeting somewhere, we use the で particle after the location.

I actually don't know when this grammar construction is taught. I haven't seen it yet. It's not in Marugoto, Tobira, Genki or any of the Dictionaries of Japanese Grammar so it's probably taught at N2 or higher.

nambatsuyoshiさん、thank you for teaching us both a new grammar point! （hyperionの先輩です。）

"でも" is very rarely used in the middle of sentences if ever. It's most often used to start a sentence. For the middle of sentences, "が", "けれど" and "けど" are most often used to connect two contrasting clauses.

I memorize 〜に乗る together. I think it signifies the direction of boarding or getting on a vehicle or idea.

Ah, right, I've had が in my corrections a number of times. I'll keep it in mind.

Also, fwiw, the whole sentence corrected is also a bit of an advanced construction which I haven't learned yet.

nambatsuyoshiさん、またありがとうございます！

whooops! ＊hyperionさんの先輩です。

すみません、hyperionさん！

大丈夫です！