Morse code is still in use internationally after more than a hundred years. Many military personnel are still being trained in it.
Due to modern technologies, telegraphy has drastically lost its importance. But the simplicity of the equipment and the robustness of the signal transmission keep this operating mode alive - together with another reason: the friends of telegraphy itself! It is fascinating to experience how the dots and lines in your head turn into words and sentences on their own. Giving and hearing the signs must be studied in such a way that the individual signs do not have to be "translated" in the head, but rather "understood".
Numerous learning programs are available on the Internet. Books can also help you learn this skill. One of the most famous of these is arguably
"The Art and Skill of Radio-Telegraphy" by William G. Pierpont.