What is a component library?
The strenght of the Figma tool is that all design is captured in little building blocks called Components. These components are designed to make designing visuals as easy as possible, while maintaining a uniform and branded look and feel.
All the components can be found in the components library. You have to activate the library with the "Book" icon in the assets pane. The assets pane can be accessed by clicking on "Assets" next to "Layers".
All components are structured per use case. When you've found the component you need, you can drag it in the workspace to use it.
The top of the asset list also has a search bar for finding your components even quicker.