This post briefly explains the criteria used to classify a hobby for categorising.
Included in the group of USEFUL hobbies are those whose performance, under certain conditions, can produce economic benefits or have practical consequences in daily life, such as food, clothing or help at home. The usefulness of health has been valued as a separate group, that of HEALTHY hobbies.
The economic or practical utility is not the initial purpose of a hobby, but sometimes it can be an exciting consequence because it can add more stimulation or emotion. Considering a hobby as applicable is not easy since said utility can be indirect or distant, as happens with studying. Although there are hobbies, such as acting in theatre and creating jewellery or clothing, that can produce economic income, it is usual that, if they do, it is in small or occasional amounts. Certain hobbies can have a direct practical consequence, such as cooking, making jams, beer, growing edible or aromatic plants or home DIY. That practical consequence is more variable in hobbies such as fishing or hunting. Some hobbies produce benefits only depending on what you decide, such as building beautiful crafts that are later given away or taking wedding photos of family or friends. In our list of tools we have only included tho that seemed to us to have an apparent use, even if they were
Suppose the hobby is profitable. It can be a profession. Many of the hobbies have their l aspect in professional activity, as is the case, for example, in any sport, sewing, cooking or electronics. That is why sometimes those that do not have their professional equal, such as crafts or collecting, have been considered the most genuine hobbies.