Porfolio Project (front-end): fotoarq_2021 (photos)

Hello, and thank you all for taking the time to see my initial version of the portfolio.
It looks very simple, and I thought it would take a few hours, but it took weeks …
The result you can see at http://www.fernando.arq.br/ and the code also at GitHub - stankuns/fotoarq_2021: photo portfolio 2021 (I’m not sure how to publish on git).

I tried to use html, css and a little bit of javascript, but it is still a work in progress, very early, and any suggestions will be welcome.

For example, I created a code in JavaScript to change the 12 thumbnail images when you hover over, but I had to do this one by one. It worked, but surely there must be a way to do this with fewer lines, in case I have hundreds of images, or still want to change the language of the text over the image, for example. Could anyone tell me how? (fotoarq_2021/script.js at main · stankuns/fotoarq_2021 · GitHub)

Thanks again, Fernando