Before doing any customization for Dynamics 365 CE, it is very important to understand where we can keep our customized components. A solution acts as a container for Dynamics 365 CE components. All of the components that we see in Dynamics 365 CE are a part of the solution, which is known as a default or a base solution. When you are connected to your Dynamics 365 CE application, if you navigate to make.powerapps.com, which is a new way to access and modify your solutions, you can see the default solution for your organization, as shown in the following screenshot:
You can double-click on Default Solution to see all the components it has. We can use the filter dropdown to see only a specific type of solution component, such as the following...