Show ID

Use the following template tag within the Loop.

the_ID()

https://codex.www.ads-software.com/Template_Tags/the_ID

Thanks but is it posible to put it in a variable?

$postID = get_the_ID();

Thanks! ??

Fo some razon $postID = get_the_ID(); seems to not be working but this worked:
$postID=$post->ID;

One more question, do you know how is it posible to get the cat ID too?

https://codex.www.ads-software.com/Template_Tags/get_the_category

thanks!