I turn the key and I hear a click then nothing

Hello,

When you turn the key and the starter clicks sometimes and starts the other, it could be due to a weak battery cable to the starter or a bad starter.
First check to see the cable is secured and clear of any corrosion.
If it still has the same issue, then the starter is likely bad and need to be replaced.

Here are some helpful articles:

https://www.2carpros.com/articles/how-a-starter-and-solenoid-works

https://www.2carpros.com/articles/how-to-replace-a-starter-motor

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.