Ruben has a Chromebook and wants to do photo editing. He can't use Photoshop or Lightroom with a Chromebook. Leo says not yet, but it's coming.
Google Photos online will give him some good photo editing and management capability. Most modern Chromebooks support Android apps, though. Snapseed would work on that. If he has an older Chromebook, there's a Chrome extension called Polarr.
Where can he post photos for feedback? Leo says Flickr really is the best, especially now that SmugMug has bought it. There's also 500pix.com.