How do I build a similar page "Stream"?

Hi Thomas,

Do you mean the columns of posts?

This is built with WP show posts plugin, you can set columns in the plugin.

Hi Ying,

I mean the columns of post and the big hero image including the newsletter.
Thank you for getting back to me. I will look up WP show posts plugin.

All the best!

The big hero image is a full width container with background image and some Headline blocks (from Generateblocks) on top of it.

The email part is the second container with a shortcode block inside, the shortcode is generated by MailChimp plugin. There's a negative top margin applied to the second container, so it overlaps with the first container.

You could use Header element to merge the front page with header.
https://docs.generatepress.com/article/header-element-overview/

This whole home page is built with Generateblocks plugin free version as block editor.
https://generateblocks.com/
Some video to help you learn how to use Generateblocks:
https://www.youtube.com/channel/UC6qhGBk96asTcTWW42-yT2Q

The site footer is built with Block element.
https://docs.generatepress.com/article/block-element-overview/

Thank you Ying for your support. Much appreciated.

You are welcome :)
Glad to help!