I recently added questions and answers to my Nim FAQ.

What is a calling convention?
https://internet-of-tomohiro.netlify.app/nim/faq.en#procedures-what-is-a-calling
-conventionqmark
What is the difference between variables inside procedures and outside
procedures?
https://internet-of-tomohiro.netlify.app/nim/faq.en#coding-what-is-the-differenc
e-between-variables-inside-procedures-and-outside-proceduresqmark

Any feedbacks are welcome!