One of my friends who just opened a bookstore decided to hold her first book giveaway. She needed a professional poster but her budget was tight. And she didn't know anything about design. When she came to me for advice, I immediately recommend that she use online tools.
I used to go to sites like Canva and Picmonkey a lot. But, there's a newcomer that caught my attention: Designbold. I really like their drag & drop concept and the fact that almost all of their layouts and resources are free.
Ease of use and free templates; who wouldn't love that?