Buy only the things that can be useful to me,and not wasting my btc with the things that has no value.
Like what? You need to be specific with your method because things will have no value for you but could have a value for others. Remember that we are unique individual and we have different interest so it differs base on what we like to do or not.Maybe he don't want to share what is useful to him
as you said it maybe not useful to you but useful to him then why bother . About the topic well i can say im not that good in managing money because i haven't tried it yet. Each time i have my salary, i gave 100% of it to my mom. And ill just ask for an allowance.