How to write a resume?

Hello DEV community,
I am getting my portfolio and resume ready to begin applying for junior dev jobs. My problem is, what do I put down on my resume? I don't have any professional experience and the only projects I have completed are from Frontendmentor and from Udemy courses. Do I list those under the experience section? And also, what if your projects are not built 100% correctly? I ask because I have some projects where the web pages are displayed differently in different browsers. And should I add my retail experience to my resume along with my degree in Finance?