Thanks for inviting me Ayoola.
@prank7 has covered pretty much everything. Since you are coming from an Angular background, I'll just add couple of points to reinforce some concepts.
Angular is an MV* framework whereas React is just the 'V' in MVC. Many developers use React as the view layer and many others combine it with Flux architecture. I suggest you start with plain React and then combine it with Flux.
Angular relies on two way data binding while React promotes unidirectional data flow. You should remember this while making the transition from Angular to React.
Here is a very nice video tutorial by Ben Nadel that compares React with Angular. Do check it out.
Let us know if you have any questions!