I love to cook, though I never know which onions are best to use. Yellow or white?!

I love to cook, though I never know which onions are best to use. Yellow or white?

I would love an explanation on yellow and white onions. In what dishes should I use them in?

i'll give you the simplest answer, usually there are three colors of onions, white-yellow-red/purple, just keep it in your mind that the lighter the color the sweeter the onion, the darker/more red the stronger...