I use EasyEDA, it is a free, zero-install, web and cloud-based EDA tool suite which integrates powerful schematic capture, mixed-mode circuit simulator and PCB layout in a cross-platform browser environment, for electronic engineers, educators, students, and hobbyists.As EasyEDA is completely free, super easy to use, and feature-rich, it holds the first place.
Pros:
Huge and ever growing community
Parts library is quite massiveVery powerful simulator
High-quality PCB designing is possibleDesigning circuit/PCB is free from any kind of hassle.
Beginners can easily get started to EayEDAEasyEDA is completely FREE

Cons:Getting the simulation done is kinda difficult. You need to follow the guide.