Hello Everyone, In this tutorial, I am going to provide a step-by-step process to create a custom(without using Letterhead) email template that gives you a quick start on a Salesforce email template. So without wasting the time let's get started,

Create a Custom Email Template in Salesforce

Step 1: Log into your Salesforce Org.

Step 2: Navigate to Setup | Communication Templates | Classic Email Templates and click on New Template Button.

Step 3: Select Custom(without using Letterhead) radio button and click on Next button.

Step 4: Fill all the information just like the image given below and don't forget to check "Avilable for Use" checkbox after that click on Next button.

Step 5: Enter some content in Email Body, after that click on the Next button. 

Step 6: Click on the Copy text from HTML version button that will open a warning alert message click on "OK" button to populate your HTML body as text format then click on Save button.

Step 7: Now click on "Send Test and verify Merge Fields" button that will open a popup window, In the popup window select user in both dropdown list and checked Send email preview to checkbox after entering an email id then click on OK button.
Output:
See also:
Conclusion:
Hope you like this tutorial, for any query or suggestions please feel free to comment.
Thank you.