How can make really dim brights brighter. And the dash light doesn't turn on (the prnd and mileage lights). I've jumped my car once when it died and they all turned on but they never did after that. The speed needle lights up and so does the gas but the bottom half doesnt
You are describing symptoms of a bad ground in your electrical system.
Check your ground on the battery. The negative post. Make sure you have a solid connection. The clamp on the negative shouldn't wiggle or have any play in it. Check for corrosion. The white powdery substance. If you find any remove the battery post clamp from the wire and use baking soda mixed with water to clean the clamp, the post and the wire. Do the same with the positive side.
Check the grounding wire from the battery to the chassis or engine and validate that it is secure and free of corrosion. Check the grounding bolt for corrosion and clean with baking soda solution.
Use the baking soda solution liberally in your efforts. Validate secure connections for both sides of your battery negative wire (vehicle ground) and the positive.
When are you are done using the baking soda solution rinse it off with water and dry. Use an old disposable rag to do it, any remnants of battery acid will degrade the rag into tatters.