Are you talking about carpenters who do external construction (on the construction site), carpenters who do home improvement (who do partition closets at home) or carpenters who do furniture?

Anyone who works as a carpenter can be called a carpenter. However, there are obvious differences in personal skills between carpenters engaged in civil engineering (site) and carpenters engaged in interior decoration. Carpenters engaged in interior decoration can mostly make some conventional furniture, partitions and ceilings. All these techniques, as long as you study hard, are not afraid of hardship and dirt. For those basic things, you can master them in 1~2 years, and then constantly improve your technical level by accumulating knowledge and summing up experience.