To check if an online session is secure, there are several steps you can take:

1. Check if the website's URL starts with "https" instead of "http". The "s" stands for "secure" and indicates that the website has an SSL certificate and that the connection between the web server and the visitor's browser is encrypted.

2. Look for the padlock icon in the browser's address bar. If a padlock is displayed and the address bar turns green, it means that the website has an EV SSL certificate and that the identity of the website has been validated by a trusted third party.

3. Use a browser extension like HTTPS Everywhere to ensure that you always connect to websites via a secure connection.

4. Avoid using public Wi-Fi networks or networks that you are not sure are secure. If you must use public Wi-Fi, use a VPN service to encrypt and protect your connection.

5. Be cautious when entering sensitive information, such as passwords or credit card details, on websites. Always check if the website you are using is legitimate and has a secure connection.

6. Make sure your antivirus and anti-malware software is up to date to prevent malicious software from infecting your system and stealing personal information.

By following these steps, you can improve the security of your online sessions and protect your personal information from hackers and other threats.