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EDITO: I'm creating a website and the images they gave me are too big. In Windows I used Photoshop to reduce the size, or maybe it is better to say scale the size, because I want to keep the whole image, in a smaller size, to be able to put them in the grid.
I ask for advice here, because I never use an editor in Ubuntu, I see all that there is in: Ubuntu Software, but not what would be the most appropriate for professional image editing, in the creation of a website, and to be able to give the best possible appearance to the images. In this case, reduce the size of some images, or perhaps it would be better to say, re-dimension. Thank you.