Canva is versatile and doesn't take long to learn - or use!
Bag of Tricks (Tools of the Trade)

Canva: The Creative Professional’s Best Friend

Writers are creative - no one doubts that. But what we paint with words we may not manage to do with graphics. And we don't usually have to. Stock imagery exists for a reason. Does that mean you SHOULDN'T learn to play with graphic designers? NO! Canva is one of the easiest platforms out there - and it's free!