what was the first dino i wanna know what you think, if u dont get it right dont worry im gonna be giving the answer later

eoraptor

Explanation:

 this is kinda controversial so yeah. anyways, this was one of the deepest and was kinda small when archeologist found it. they think it was on earth about 231 million years ago.

source(s)

https://www.smithsonianmag.com/science-nature/scientists-discover-oldest-known-dinosaur-152807497/#:~:text=Art%20by%20Mark%20Witton.,as%20the%20earliest%20known%20dinosaur.

The first dinosaur was the Eoraptor ≈230 million years ago.

Explanation: The Eorapter lived during the Triassic Period, which was from 205-250 million years ago. Hope this helps, and have a great day!

the answer is blue river