Things you need to know before you delete your Gmail ID:

Gmail account and Google account are not the same. Hence, you can keep using other Google services without a Gmail account.If you use this account to recover another Gmail or Outlook account, you should change it.If you use this email ID with a bank account or you have created accounts on various third-party sites like Facebook, Twitter, etc. you should change it before deleting the ID.All your conversations, i.e., email messages, will be gone unless you create a backup with Google Takeout.Your Google Play purchases or search history will not be deleted.

Delete Gmail account

To delete your Gmail email account, follow these steps: If you need detailed instructions, read on. To get started, sign in to your Gmail account, click on the profile picture visible on the top-right corner and select My Account. Alternatively, you can open this page directly.

Now you have to click on Data & personalization and then select Download, delete, or make a plan for your data. Then click on Delete a service or your account. You will be asked to again enter your password. After entering your password, you will find all the active products in your Google account.

If you have already created a backup, click on the trashcan icon visible next to Gmail. Otherwise, click on DOWNLOAD DATA button and download all the backup and then click on the trashcan icon.

This is when you need to enter another email address to keep using other Google services. It should not be a Gmail ID.

If you click on the confirmation email received in your secondary email account, you will be greeted with a window like this-

Now, you need to choose Yes, I want to delete [email id] permanently from my Google Account and click on DELETE GMAIL button.

After that, if you try to open Gmail, you will see a window like this-

If you accidentally deleted your Google Account, you have a short amount of time to try to recover it. Go here and follow the steps to verify that the account is yours. You can always use other services such as Google Drive and all with the secondary email address. Related reads:

How to permanently delete Yahoo accountHow to delete your Microsoft Account permanentlyHow to delete or close Outlook.com email account permanently