The Linux Tutorial app by Get Start - Learn Technology is an excellent tool to learn Linux from scratch. It is designed for beginners who want to learn the basics of Linux and its command-line interface. The app covers a wide range of topics, including managing users and groups, automating tasks, and installing software packages using apt-get, yum and rpm package managers.

The app's user interface is simple and easy to navigate, making it easy to find the information you need. It provides step-by-step instructions, command examples, and explanations. The app also covers advanced topics, such as setting up FTP, NFS, and Samba servers, and securely copying files over the internet.

Overall, the Linux Tutorial app is an excellent resource for anyone who wants to learn Linux. It is free and available on the Android platform, making it accessible to anyone with an Android device.