@Acer
Let's see.
1. Original question: You can create a /etc/motd file with a login message of your choice, which will be displayed after successful authentication.
2. your-last-comment: The etc motd file can be used for system announcements and other important information.
You may find useful the article in the following link: https://www.networkworld.com/article/3219736/how-to-use-the-motd-file-to-get-linux-users-to-pay-attention.html