Show specific category on front page

Dear code-gods of the wordpress support forum,

I’m busy with designing a website for a client of mine. The webadres is https://www.eentweehupsakee.com. As you can see, the front-page shows the last 4 newly added posts. I want the theme to only show posts from a specific category in these 4 items. I’m using a custom theme named “Widely”. I’ll post the code from the front-page.php file below.

I’m not an experienced coder so I would like to know which piece of code I have to put where in the php file to get everything to work.
Hopefully you masterminds can help me out! I would be eternally greatful!

[Code moderated as per the Forum Rules. The maximum number of lines of code that you can post in these forums is ten lines. Please use the pastebin]