The car will not start but the lights and all turn on when the key is turned

Hello,

So, when you turn the key what does the engine do? Does it make any noise? Does it click, or cranks over?

Just so that we cover the basics, have you tried to jump start the vehicle?
It is possible that the battery has enough power to turn on the lights but not enough to start the engine.

https://www.2carpros.com/articles/how-to-jump-start-car-battery-using-jumper-cables

If you are able to jump start it and the vehicle runs normally, then all you will need is a battery.
If it does not start it could be due to a bad starter, faulty fuel pump, lack of spark.

Here are a couple of helpful guides:

https://www.2carpros.com/articles/starter-not-working-repair
https://www.2carpros.com/articles/car-not-running-advanced

Go through these and let me know of any questions.
Thank you.