Yeah totally! Initially just whipped this together as a MVP. Been trying to read more non-technical books so I thought about making a site that'd help me choose one to pick. Aim is to have a top weekly/monthly section as well as you said, different categories!
I personally just code for self interest and enjoy a challenge since my job is rather stale. I can't speak from experience but I'm sure having a portfolio relevant to the type of work you're aiming for would impress potential clients and enhance corresponding skills.
In total I've spent roughly a month and a half working on it but mostly only spending an hour or so every couple days on it. After understanding the architecture, the coding isn't too difficult and is immensely rewarding!
Thanks! I actually just built this tool to help me see colours better as I am colour blind but may toy around with it on weekends to see what else I can come up with :)