How to hide first post?

if you mean the latest post, you could try to use this:
https://codex.www.ads-software.com/Template_Tags/query_posts#Offset_Parameter

or if you mean the first ever written post –
you could try to use the post id in the following:

‘post__not_in’ => array(6,2,8) – exclusion, lets you specify the post IDs NOT to retrieve

https://codex.www.ads-software.com/Template_Tags/query_posts#Post_.26_Page_Parameters

Thanks so much! The template tag worked. ??