Magento 2.0.18 is the final 2.0.x release. After March 2018, Magento 2.0.x will no longer receive security patches, quality fixes, or documentation updates. To maintain your site's performance, security, and PCIPayment Card Industry: Refers to debit and credit cards and their associated businesses. compliance, upgrade to the latest version of Magento.
Your store AdminThe password-protected back office of your store where orders, catalog, content, and configurations are managed. is the password-protected back office where you can set up products, promotions, manage orders, and perform other administrative tasks. All basic configuration tasks and store management operations are performed from the Admin.
Your initial sign-in credentials were set up during the Magento installation. If you forget your password, a temporary password can be sent to the email address that is associated with the account. For increased security, you can configure your store to require a case-sensitive user name and password. For additional security, the Admin loginThe process of signing into an online account. can be configured to require a CAPTCHA. To learn more, see: Configuring Admin Security.