Hello.
I checked out the new Gtk website (https://infrastructure.pages.gitlab.gnome.org/gtk-web/) and found it better than the previous.
I want to give few suggestions, as follows.
- The bindings example for Python code is incorrect. Comments in Python start with
#. - Apps built with Gtk; the displayed apps are mostly GNOME maintained and I think, the examples should be more vivid, like cross-platform, famous, mostly used and be independent from GNOME as far as possible. Apps I think best fit for showcase: Guake, GIMP, Inkscape, Firefox (Linux version), Evolution, Transmission, MonoDevelop, Geany, Emacs GUI (?), ActiveState Komodo, Pitivi, and
[more](https://en.wikipedia.org/wiki/List_of_GTK_applications) - The features section, should put “Opensource” and should include “Free” at the starting.
- We can remove this line “…make it the most trusted toolkit for developing Linux Apps.” Gtk is cross-platform, so I think, the focus for “Linux” could be dropped.
- At the bottom, under “Support” section, “Report a Bug” is in title case but “Request a feature” is not so.
- We can remove the bindings example. I don’t know why, but it doesn’t look good. Most of the programming related websites don’t include code examples at the start (but they have a "Get started"link). Like, our first impression should be great when a person visits our Gtk website. We can keep screenshots showing Gtk in action, with a lot of fancy and awesome things that could be done with it. And below the screenshots we can link a “Get started”.
- Change “Downloads” button at the starting to “Download”. It makes more sense.
So above are suggestions I thought of sharing. Feel free to tell me why they can’t be accepted 
[The website is under development, so the above suggestions could have been already considered.]