You may easily create a signature on Gmail. A signature usually contains the full name, contact information links to a website or social media account.
Click 
and select See all settings.
Scroll down till you find the Signature section. Select Create new.
After naming your signature, you can create it by using whatever font, colour, size, and images you want to be in your signature.
After you’re done creating your signature, don’t forget to scroll down and click Save changes.
The signature will be automatically added at the end of sent messages. You may have multiple signatures. When creating an email, you can click the pen icon and select the signature you want to use.
Watch how to create a signature on Gmail
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Also read: How to find archived emails on Gmail?