Opinions ? What am I missing

I am learning ansys this semester. I did tensile test on a specimen (randomly self dimentioned) . fixed a side. Added displacement to a side. Took mesh size as default . Then tried theoretically studying everything related to it (explicit dynamics & all) , here are my notes , pls tell me what else to study :

https://preview.redd.it/xevyonehgbmh1.png?width=736&format=png&auto=webp&s=a0d6029959116ce3e8fcf421286d0ef3e8fc49a5