Ad content from another site

Whow can i link 2 wordpres site..

Ex i have

https://www.mysite.ro (1)
https://www.news.mysite.ro (2)
https://www.video.mysite.ro (3)

I want to display in my first site on the front page the content from (2),(3) site…

Can you help me with some plugin or php code , or explayn me.

Thanks