Question

usernames can only use letters numbers underscores and period

Answer 1

yes friend we can't add anything else ..

but I can't understand the last line .

hope it helps you if it so please make as brainliest....❤✨❤✨❤✨❤

Answer 2

Username:

For creating username in Google accounts, following are the rules for creating username:

• Usernames can comprise letters (a-z), numbers (0-9), and periods (.).

• Usernames cannot comprise an ampersand (&), equals sign (=), underscore , apostrophe, dash, plus sign, comma, brackets, or more than one period in a row.

• Usernames can start or end with non-alphanumeric characters except periods. Other than this rule, periods (dots) don’t value in Gmail addresses.

Hope it helped........