Lightning Email Template

We can setup Lightning email template to standardize the email sent to contacts, leads, person accounts from Salesforce. Once the email template is created, we can use it any number of times.

In below example, we will send email to Opportunityʻs contact.

Steps to create email template:-

• Go to the object which offers email functionality. We will navigate to opportunity tab from Sales application. 
• Click on Activity tab and then email.
• Select any object from Related To field. Depending on object you select, fields will be available. We will select Account in our case.
• You can use existing email template or write your own email content to send an email.
•  Click on insert merge field to select field.

•  Click on Save as new template to save email content.

•    Click on send email button to send it.
•    You can view sent email in Past Activities section.

• You can use this template to send email to any other contacts in Salesforce.
• We will send email to any other Accountʻs contact to discuss Opportunity progress. Navigate to any other opportunity and click on Activity.
• Click on template and select recently used template.. 

• Template will get copied here and click on send button to send email.

Permissions:- 

Lightning email templates are stored in private directory by default. If you have the Manage Public Lightning Email Templates permission, you can also create, edit, and delete public templates.

Step by step information to create email template can be viewed from video.

Reference link.

https://help.salesforce.com/articleView?id=email_create_a_template.htm&type=5