For save data in Firebase storage and upload file,images,videos etc need to give permission

For store data in Firestore Database :

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1. On left hand side panel,go to build, select Firestore database.
2. Click on Create Database.
   
3. Then select mode wheather for live or debug mode need to use
   
4. Now click Rules tab
   
5. Change condition by true

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   If you haven't installed it, be sure to install it first.

7. After doing true click on publish button so that you can access database.
   

For store Images, Videos, Audios, etc.:

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1. On left hand side panel,go to build, select Storage.
2. Click on Get started.
   
3. Then select mode wheather for live or debug mode need to use
   
4. Now click Rules tab
   
5. Change condition by true

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7. After doing true click on publish button so that you can access database.