Hello, I have two questions: 1- Is it legal to sell a template from lets say templatemonster.com in another website? 2 - Is it legal to use photos from wallpapers in websites? Thks.
Only if you have explicit permission from the owner of said site, and the creator of said templates to do so. See answer to question #1. To use anything from another site, and especially to sell anything you found on another site, you must have permission from the original owner.
This post doesn't belong here. Copyright questions belong in the legal issues forum. Copyright is not the same thing as Copywriting.