Customizing post display

do not edit Twenty Eleven directly – start by creating a child theme https://codex.www.ads-software.com/Child_Themes or possibly download one.

then try editing content-single.php and possibly content.php in the child theme.

Thanks, I’ll try that out. So anytime I need to change the way the posts look, I should work with Child themes and not alter theme itself?

Interesting – I activated the quirm child theme, it resulted in showing only 2 last of 5 posts. Is there any rule which selects posts in this child theme?

if a theme is likely to get updated frequently, it is recommended to use a child theme for customisation.

Thank you for the advice.