My css and JavaScript is not working

Hi I’m new GitHub. I just pushed my first website. But the problem is the css js file and image file isn’t loading. And when I click inspect, the index.html is named as / . But on the repo it shows index.html
URL is: ohitsham.github.io/tipcalculator

Edit: css and javascript seems to be working now for some reason. But still no picture & index still shows up at /

It’s normal that / serves /index.html. It’s the default of basically all web servers, so that both can be used interchangeably. And it’s usually desired to leave out index.html and file extensions for nicer URLs, also because of SEO.