Cultivating the habit to spot errors and solve the problem independently. 
While troubleshooting with their do-it-yourself coding projects, coders tend to develop their algorithmic skills progressively. Slowly it becomes a habit, which helps throughout their lives.
Train the attention span. 
When a coder is busy with the construction of a coding project, they are at their best. The reason is; improved attention span;
Learn to accept failure and try again. 
Tinkering can not always go right. Sometimes a plan may fail, and a project may not work. They tend to accept it and try again. This learning will help them to cope with the challenges and odds of life.