Need reviews and suggestions or advice on how to improve and complete my project

So I am a second year CS student and in one of the courses I am taking this semester our professor asked us to work in groups, find a real client that needs a tech solution and build the tech solution. My group found an electrical company(basically does electrical stuff and also sells electrical products) that didn't have a website. So we proposed to build one for them and I'm handling the frontend aspect.

(lyseongh.vercel.app) this is what I have been working on so far. And one of the requirements was the addition of a CMS feature which I have no idea on how to go about. So looking at the project I need some advice on how I can implement that feature and also for overall improvement. Thanks