I remember writing my own terrible CMS that my website ran on for years. Would I use it now? No. But the things I learned from building it were definitely worth the time investment - I just loved working on it, learning how classes worked, setting up a database schema for it, trying to secure form submissions and trying to hack my own work. It was fun!
And that's how developers learn!
I did the same, I used to have "Custom CMS building" listed in my freelance profile. Definitely not something to write home about, but it did the job and I learned to appreciate the work that frameworks take care for me under the hood.
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