I'm still a little uncomfortable with flexbox, but I believe that with the next projects this should improve.
What specific areas of your project would you like help with?I'm not sure why an image is overflowing inside a certain container. I tough that would fit to the parent container. The solution I found was to force the image's width or height to 100% (width). Don't know if this is enough or if it's necessary to add the object-fit property.