https://unsplash.com/ A totally free high quality photos! No copyrights restrictions, can be used for commercial purposes.
one of the largest free photo stocks https://pixabay.com/
https://www.canva.com/photo-editor/ Basic and comfortable editor for basic resizing and croping
https://pixlr.com/x/ Free and easy photo editor with a bit more possibilities, such as adding text
Has the basic features for free with a lot of other features which require payment.