As far as interest is concerned, interest is the best teacher. If you want to cultivate your hobbies, you first need to see if you are really interested in this thing. Only when you are really interested in it, will you spend time and energy to study and try to master it. If you hate something very much, you won't cultivate it into your hobby.
Secondly, we must also consider the financial strength. Some hobbies, such as some pianos and other musical instruments. If there is no special place to apply for study at school, for some ordinary families, these are actually more than the advance of their own financial situation. Therefore, they will not buy these musical instruments, let alone develop them into their own hobbies. However, for activities such as calligraphy or roller skating, the materials needed are not very demanding on the economic situation, and most people can learn it.
The last and most important point is the time base. If you want to develop a thing into your hobby, you must take time to learn it, and you need to practice all the time to master this skill. Three days of fishing and two days of drying nets will definitely not succeed. If you don't put enough time and energy into one thing, you will get nothing. Learning is like this, especially developing hobbies. Just like calligraphy, as long as you don't take a pen for a few days, your technique will be unfamiliar and you need to practice more.
Cultivating college students' hobbies is simple, easier said than done, and the important thing is persistence. As long as you can persist, there will always be gains.