What is the standard procedure for updating website content? [closed]

I have created a website with HTML, CSS and JavaScript, and I have a news sections with news cards that I would like updated weekly. But I would like the client to be able to do this themselves. What is the standard way to allow this to happen, would it be through an admin login and which allows them to edit those cards or would it be by attaching some sort of CMS to my website?

Thank you for explaining.