I use Pixlr X for very basic editing like removing a background, cropping or resizing images and for creating new images. It also has very good filters to add to images.
Then, there is Pixlr E which is a bit more robust and a simplified version of Adobe Photoshop. Here you have a lot more tools, filters and
I have used both of these versions for quite some time and they have become my "go to" editors.
If you don't want to DIY your graphic design, then let me know!