This tutorial illustrates how to write C programs with Gtk4 library. It focuses on beginners so the contents are limited to basic things. The table of contents are shown at the end of this abstract. - Section 3 to 20 describes basics and the example is a simple editor `tfe` (Text File Editor). - Section 21 to 23 describes GtkDrawingArea. - Section 24 to 27 describes list model and list view (GtkListView, GtkGridView and GtkColumnView). It also describes GtkExpression. Please refer [Gnome API reference](https://developer.gnome.org/) for further topics. This tutorial is under development and unstable. Even though the examples written in C language have been tested on gtk4 version 4.0, there might exist bugs. If you find any bugs, errors or mistakes in the tutorial and C examples, please let me know. You can post it to [github issues](https://github.com/ToshioCP/Gtk4-tutorial/issues). The latest version of the tutorial is located at [Gtk4-tutorial github repository](https://github.com/ToshioCP/Gtk4-tutorial). You can read it without download. If you want to get a html or pdf version, you can make them with `rake`, which is a ruby version of make. There is a [documentation](../doc/Readme_for_developers.md) how to make them. If you have a question, feel free to post an issue. Any question is helpful to make this tutorial get better.