LinkedIn has the options you can set up the two-step verification to enhance account security. You can set this when you first create your LinkedIn account, or you can set it up anytime after. Please follow the steps below for details:
Step 1: Please check here to login your account or create your personal LinkedIn page;
Step 2: At the top of your LinkedIn page, click "Me" icon;
Step 3: Click "Settings & Privacy" in the drop-down list;
Step 4: In the new window, click "Account" tab, then click "Login and security" from the left navigation and click "Two-step verification";
Step 5: Click "Add a phone number" in the list;
Step 6: For the security reason, after you select the country and enter the phone number, LinkedIn will ask for the password to verify your ownership;
Step 7: Type the verification number you received and your two-step verification is set up.