Code to display articles with a certain tag

Hello!

I’m a little new a WordPress and I just need the php code to display all articles that are tagged with let’s say “milk”.

The reason is because I’m creating a custom page (different look than the main theme) that is displaying an excerpt of all articles matched with a certain tag.

I Googled this topic and searched these forums but could not find any results, so any help on this is much appreciated. Thank you!