If you still need to improve the way you use the keyboard, know and see how to install the Klavaro typing application on Linux.
Klavaro is an application that offers a free typing tutorial for those who need to improve productivity when typing, or simply learn how to type correctly.
Klavaro uses a clean graphical interface. It helps to improve typing by offering a basic course, adaptation exercises, speed exercises, fluency exercises, progress charts, etc.
All new versions of Ubuntu provide Klavaro in their basic repositories. So you can install it using a single command.
sudo apt-get install klavaro