The reason for the car not starting.
It has probably happened to you that it does not start in the cold. The point is that not starting is completely different from not turning on, and you should keep this in mind. This video is about the car not starting, which means that you start the car when you want to. No sound or reaction can be seen from the car.
4 important factors have an effect on not starting:
Car battery - starter - dynamo or alternator - switch.
Before doing anything, first check the fuse of the car because it is possible that the fuse of the car is burnt.
The first and most important factor is the battery. First, you should know how to test the car battery with a multimeter, and if you don't know this, you should try the method of testing the car battery with a car light.
The second cause of failure is the car starter. Among the problems of running out of starter coal, starting dirt and stuck starter coal, breaking the starter gearbox, and automatic starter failure.
The third cause of failure is the dynamo or alternator of the car. If the alternator is damaged, the car's battery will not be charged properly and the car will not start. To ensure that the alternator is healthy, the car's alternator should be tested. There is a car dynamo test with a multimeter, a dynamo test with a dynamo tester, and a car dynamo load test with a car light.
The fourth factor is the switch, which is likely to have caused this problem.
In any case, if you cannot solve this problem yourself, you should go to a car electrical repair shop.