modified: README.md

modified:   docs/desktop-environments/kde.md
renamed:    docs/desktop-environments/xfc4.md -> docs/desktop-environments/xfce4.md
new file:   docs/display-managers/gdm.md
new file:   docs/display-managers/sddm.md
new file:   docs/display-protocols/wayland.md
new file:   docs/display-protocols/x11.md
new file:   docs/window-managers/hyprland.md
new file:   docs/window-managers/kwin.md

docs/display-managers/gdm.md

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+# GDM - GNOME Display Manager
+
+GDM (GNOME Display Manager) is the default graphical login manager for the GNOME desktop environment. It provides the login screen, manages user sessions, and supports both X11 and Wayland.
+
+**🧩 Key Features of GDM:**
+
+- **Graphical login interface:** Presents a polished, user-friendly login screen.
+- **Session management:** Lets users choose between desktop environments and session types (e.g., GNOME on X11 or Wayland).
+- **Accessibility:** Offers built-in support for screen readers and other assistive technologies.
+- **Security:** Runs the login screen as a separate user (gdm), isolating it from user sessions.
+
+**🛠️ Technical Details:**
+
+- Written in C and maintained by the GNOME Project.
+- Supports Wayland and X11, automatically launching the appropriate session.
+- Highly integrated with GNOME, but can also be used with other desktop environments.
+
+**🧭 Usage and Configuration:**
+
+Default in Ubuntu, Fedora, and other GNOME-based distributions.
+Configurable via /etc/gdm/custom.conf for settings like autologin, Wayland enablement, and session defaults.

docs/display-managers/sddm.md

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+# SSDM (Simple Desktop Display Manager)
+
+SDDM (Simple Desktop Display Manager) is the default graphical login manager used by KDE Plasma. It provides the interface where users log in to their desktop session and switch between user accounts or desktop environments.
+
+**🧩 Key Features:**
+
+- **Qt-based:** Built with the Qt toolkit, making it visually consistent with KDE Plasma.
+- **Wayland and X11 support:** Compatible with both display protocols, aligning with KDE’s transition toward Wayland.
+- **Theming:** Highly customizable with animated and branded login screens.
+- **Session management:** Allows selection of desktop environments and user sessions.
+
+**⚙️ Configuration:**
+
+- **GUI:** Accessible via System Settings → Startup and Shutdown → Login Screen (SDDM).
+- **CLI:** Configurable through /etc/sddm.conf or /etc/sddm.conf.d/.
+
+**🧭 Role in KDE:**
+
+- Replaced KDM (KDE Display Manager) starting with KDE Plasma 5.
+- Used by KDE-centric distributions like KDE neon, OpenSUSE KDE, and Fedora KDE Spin.