Step 1: Login Google Firebase

Step 2: Create New Project
As you click on Add Project, following dialog box will pop up:

It will take a few seconds to create the project. Once the project is ready, click continue.

Step 3: Manage Project Settings
Once the project is created, click on Project settings.

Step 4: Find Firebase Keys
In the project settings, click on General settings. From here, you can directly get the web API key.

Now, click on cloud messaging settings for Server key and FCM sender ID as shown in the below snapshot: HERE is missing an Image!?
Conclusion
And it’s done. Creating Google Firebase keys isn’t tricky in any way. If each of the above-mentioned steps is followed properly, it’s just a matter of few clicks and entries.