please check my code, i can't understand one thing ;)

Question

https://code.sololearn.com/WzfWM1Wobnph/#html

Answer 1

"Defines from thin to thick characters. 400 is the same as normal, and 700 is the same as bold".
https://www.w3schools.com/cssref/pr_font_weight.asp

Answer 2

ah, get it, thank you ;)