Wikipedia description of Apprentice https://en.wikipedia.org/wiki/Apprenticeship
The profession of thatching is learned through apprenticeship
Carpentry is another profession learned through apprenticeship
An apprenticeship is a system of training a new generation of practitioners of a trade or profession with on-the-job training and often some accompanying study (classroom work and reading). Apprenticeship also enables practitioners to gain a license to practice in a regulated profession.