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Hello, I have the following problem, when I turn the ignition key on the car, it starts to turn the engine very slowly, then the engine turns off and I can't turn it on again, which is the problem. The battery is fully charged and the terminals are cleaned and tightened.

 

[2.2]

Have you got a meter to check the battery? If you put the headlights do they work OK? Put the hazards on, do they work OK?
Have you got a battery charger?... Tried charging the battery?
Check the terminals on the starter motor are tight. Check the earths which are underneath the battery are not all corroded and are tight.
Lastly, connect the battery directly to the starter motor and see if it works OK. If not, then looks like starter motor could be faulty.

Thank you!