Creating best quality image for online use - Jpeg

Hi Guys


What will be the best method for creating the best quality Jpeg image for use online - the website states the size of 3000x850 will be accepted.

So in Corel I create my image of 3000x850 pixels then resample/change the resolution to 72Dpi and then export this for the Web as a high quality jpeg in RGB color mode

Is this the correct method for good quality online images?


Thanks

Olge