How can I add opacity to background image

Question

Step by step

Answer 1

https://code.sololearn.com/WGeXCDL6IMRg/?ref=app

Answer 2

check this resource for background images :
https://love2dev.com/blog/responsive-hero-background-opacity/

also this for any kind of images :
https://www.w3schools.com/css/css_image_transparency.asp