Problem with blog background and header image (not responsive)

Hi, I’m new. I’m trying to do my site and I’m not very experienced in this area.
I have problems with background images that are not responsive.
How can I do?

PS: I can not link the site because it is in maintenance mode, if there are problems I can remove this mode to show you, while I leave the screen.

Hello there,

I hope you are doing well today.

Could you please provide a link to your website so that I can inspect it?

Best Regards,

yep, the link is site

Pictures are taken not from the link you posted here, we need to see the actual website

yes, sorry dude.
But i have a problem with the gif on jumbotron section too.