I turned the key but did not start?

So to be clear the engine does not crank over (starter), correct? If so, I would make sure the battery cables are clean and tight.

This guide can help:

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Here is a video as well:

https://www.youtube.com/watch?v=6YRW8fyNudY&t

Please go over these guides and get back to us. Please upload videos in your response of any problems so we can see what to help you with.

"but it still won’t turn over?". This is why I asked if you meant running or cranking over.

If the battery is good, 9 times out of 10 this will be the starter or the starter relay as long as the battery cables are clean and tight, here is the starter wiring diagrams so you can see how the system works. Please go over the video again and here is a more in depth guide for the starter not working, I would also try swapping the starter relay out, also use a test light on the starter trigger wire while the starter is not working (you will need a helper to hold the key for you).

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

You can take the battery to the auto parts store for testing FYI. It could be just a bad starter motor which is common. Check out the images (below). Please let us know what happens.