Summarize this article in one sentence.
Click the magnifying glass-shaped icon in the top-right corner of the screen. This will search your Mac for the Mail app. It's a stamp-shaped icon near the top of the Spotlight search. Doing so opens your mailbox. This pen-and-pad icon is in the upper-left corner of the Mail window. A new mail window will open. If you want to forward an email instead, click the email that you want to forward, then click → at the top of the email. In the "To" field, type in a person's email address. This is the main person to whom you'll send the email; their email address will not be BCC'd. You can add multiple email addresses by pressing the Tab ↹ key after each one. It's in the upper-left side of the Mail window. A drop-down menu will appear. You'll find this in the drop-down menu. A "Bcc" text field will appear near the top of the window. Type in the email address of the person to whom you want to send the email via BCC. In the main section of the email window, enter your email's information. It's a paper plane-shaped outline in the upper-left corner of the window. Doing so will send your email to all email addresses listed, though only the email addresses in the "To" field will be visible.

Summary:
Open Spotlight . Type in mail. Click Mail. Click  Compose. Enter a recipient's email address. Click ☰. Click Bcc Address Field. Add an email address. Write your email. Click  Send.