Running can increase the upper limit of stamina, which is the battery in the upper right corner when moving at night, and earn gold coins and materials. This is a highly cost-effective development method in the early stage. So at the beginning of the game, you can use your energy to run every morning. Maybe you can't defeat the enemies at the start of the run. You can choose to run away. When you reach two or three hundred energy points, you can fight against the enemies in the town. Defeating them can get you materials and gold coins. At least it won't be so painful during the gameplay. After running for two or three weeks, you can enjoy yourself very comfortably. (These are just my personal suggestions for playing. It's not necessary to do so. It's just that this can reduce the trouble caused by low stamina in the early stage.)