Home page like wordpress.com

Add a <!--more--> tag in the post’s content so it displays an excerpt.

https://www.wikihow.com/Add-Read-More-to-Wordpress

I know that but I need it automatically (is not for me).
I will try to make it automatically, if I can’t, I will try with that.

Thanks for all ??

You’ll need to use a child theme and customize the index page then.

Problem solved with plugin “Auto Limit Posts Reloaded”

Thanks, it was other alternative (child theme)