I don't normally make guesses, but here's one based on the experience of huge numbers of similarly poor questions to yours: "The battery seems to be okay". So you've noticed that some of the lights come on. No, that's not okay, even a flat but not totally dead battery will do that. So my guess is that you have a flat battery.
If so, you need to find the cause. It could be that you have another unconnected fault which makes the engine difficult/impossible to start and so you've run the battery flat trying to start it. Perhaps the battery is 3-5 years old now and no longer able to hold sufficient charge to start the engine. Maybe you've been doing loads of short journeys and using lights, heated rear window, and other electrical accessories so the battery didn't get sufficient running time to recharge. Maybe the generator belt is broken or slipping. There could be some new accessory you've had fitted and it's been done badly so that it drains power even when the ignition is off. The list is by no means exhaustive. But the first step would be to remove the battery and recharge it, and make sure you have the radio codes before you disconnect the battery (disconnect earth/ground/negative terminal/black cable first, reconnect last), or the radio won't work afterwards.
But ultimately, and with every respect, your question betrays a total lack of any present ability to be able to sort this out yourself, so you're going to have to call in a breakdown recovery mechanic or a knowledgeable relative or friend.
What a vague question. No one here can answer you. You are asking something that can't be diagnosed asking why it won't start. We need more specifics as in does it turn over and not start? Does it act like battery is dead. Does it click. Does it try to start. It could be 150 things. Call a mechanic and get them on a house call that can hear what it is doing or hear what it is not doing. Smh :(. Holy vagueness
A good battery is one of about 1000 things that are required for an engine to start. Can you narrow it down a little more? How do you know that it is not starting?
The "Problem" is that the engine won't start. The ANSWER is to pick up a telephone and call someone who can come and look at your car to determine the cause of your problem, and maybe even repair it.
Is the car cranking but no start?? Or is it just not doing anything?? If is just cranking but no start, i could be gas, spark, crank or cam sensor...if is just clicking it could be the starter.. battery could be low.
You are out of gas.
