I've certainly talked up Canva a fair few times on social media - and for good reason.
It brings the ability to make beautiful professional images to the lay person, letting you layer images, patterns, filters and text easily. It won't let you create the custom images that something like Adobe Photoshop or GIMP would, but man is it a nice easy tool to use. We use it for our social media posts regularly - so I thought I'd share the making of a Xmas social media post with you...so simple!
Update:
Adobe has also come to the party more recently with a similar product to Canva. Have a look at
Adobe Express if you'd like to stick within that Adobe ecosystem.