@Kim_Minjyun usually shops will use layout, like the multiple menus in the page. when you clicked this you'll be brought to this page and stuff. there's also the story layout usually if you open a story's chapter and it have this unique border around it or yeah stuffs like that
The answer to this question is listed on the FAQ: https://www.asianfanfics.com/page/faq#karma2
But to make it easier for you, the traditional ways to gain karma points are by commenting on another user's story or blog, getting subscribers or upvotes on your own story, someone purchases a layout that you made in the layout marketplace, and when someone gifts you karma points.