GNOME

GNOME Shell Extensions

Visit their site. Install and enable the GNOME Shell integration from your browser
You can view my list of installed extensions
Also install Extension Manager from Flathub to manage these

sudo dnf install gnome-tweaks

sudo dnf install adw-gtk3-theme

Now set the them for Legacy applications to Adw-gtk3-dark under Appearance section in the Tweaks app

Visit gnome-look.org to browse system themes, icon-packs, cursors, GRUB themes etc. (might have to debug to get it working)