How to show your projects and works to an employer?

Question

Career in IT

A novice web programmer, I am writing my website so that there is something to show the employer when applying for a job. If I upload my project to any git repository, to the same github, for example, then how does the employer know that I did it, and did not steal it from someone? Especially if I don't have commits because I wrote the project at 80%, and then only uploaded it to github. And if I write a website at all and upload it to some kind of hosting, then it’s all the more incomprehensible how the employer knows that this is my job. After all, anyone can just take someone else's project, upload it somewhere and say that he did it.

Answer 1

at the interview
you will show how you implemented the functionality and why

Answer 2

don’t worry, it’s noticeable if a person didn’t do something himself)