Need to check if there's a difference between improving a JPG file's quality and converting it to a better format. But since the user asked for "jpg better," probably stick to enhancing while keeping as JPG, though converting to PNG might be an intermediate step.

I should start by outlining the possible reasons a JPG might look poor. Common issues include low resolution, high compression, distortion, or color inaccuracies. Then, list methods to improve these issues. Each method should include step-by-step instructions and maybe some tips.

One approach could be using image editing software. Tools like Photoshop, GIMP, or even online editors like Canva might help. For beginners, maybe recommend online tools first, then mention desktop software for more advanced users.

Another thing to consider is the aspect ratio and cropping. If the image is not composed well, cropping can improve the focus and remove unnecessary parts.

Color correction could also be part of the guide. Adjusting brightness, contrast, saturation, and hues to make the image look better. Tools like Lightroom or even free software like IrfanView can do this.