how is this part moving without any code? what is he using?

here is the link to a short video his making that project move and without code what is he using?

https://www.tiktok.com/@yuckmaster/video/6974135761536830725?lang=en&is_copy_url=0&is_from_webapp=v1&sender_device=pc&sender_web_id=6975664200623228417

There is an object called "BodyGyro" which is most likely being used.

I haven't watched the video but it's probably attachments like motors, springs, hinges etc...

You can insert them by right clicking on a part and there's plenty of documentation on the wiki :)