I usually recommend KiCad for designing printed circuit boards (PCB).
But if you just want to create a simple board quickly, and you don't want to set aside an hour or two to learn a "proper" tool - then Fritzing is a good alternative.
Fritzing is the easiest to learn. It's very intuitive, and the graphical interface is simple and easy to understand.
The backside of Fritzing is that it is very limited. And designing advanced boards on Fritzing is complicated, or even impossible in some cases. That's why Fritzing is not usually used professionally by electronics engineers.