My car battery can't be charged because of sulphation

God, I can't start my car. My plan will fall through. I should have driven my car to the park with my friends but the car drops the ball. I am sad I can't go there. Then I start to check it. When I find it's all because of the car battery. I am so surprised. 

I charge the battery with a charger, but the indicator light is unlit. I guess the light is broken. Then I leave it alone. But after several hours, there is no reflect on the battery. In general, the car battery will be a little hot, but nothing is found. That means this car battery can't be charged anyway. I have to spend extra money to buy one although I am not willing.

When I are planning to throw it away, I find there are some crystals on the surface of any car battery. I remember that one ever told me it’s sulphation if the crystals are found. Oh, my god. It must be over discharging. The professional said, "The reason behind this is a chemical process called sulphation. When a car battery is charged this chemical process cannot take place. However, when the battery's voltage falls below 12.4V this process begins. The process causes sulphur crystals to form on the lead plates inside the battery, which in turn increases the battery's electrical resistance. The longer this process is allowed to continue the worse the effect. Eventually the battery will become so electrically resistant, that you will be unable to charge the battery, let alone draw power from it."

This makes me crazy. Bad car battery, and no maintenance, is so terrible. I think I need to learn some useful knowledge to help me get out of this trouble.