Rating API to WordPress core

hi,
im new to wordpress soo I’m sorry if my question look bad or mistraded.

i want to sugest add RATING system to post like (star) (heart) (like) or other. it become popular item now.
i have search many place but couldnt find wordpress class related to it Q,Q
, the only i found was Plugin, but i hate use plugin. it overburden my site.

https://wordpress.org/plugins/post/