Plague Technologies was my first 100% self-hosted, created from scratch, website.
I used it to advertise to potential clients and find work when I was a young freelancer. You will see plenty wrong with the site but it serves as a sign post of how far I have come. From sitting in my bedroom plugging away at all hours before and after work to learn more, get better, and engage the community to a professional foothold in the industry.
I work in IT now but my web development experience has greatly helped me to deliver better infrastructure and support because I had plenty of opportunity to understand how it all works instead of just turning it on and telling a developer to have at it.