1. The group owner or administrator can send a welcome message to inform the students that they are welcome to join the training group and briefly introduce the training-related matters.
2. The group owner or administrator can send private letters to the students one by one, asking them if they have any problems or need help in training and providing them with help as much as possible.
3. If you have any questions or need help, you can ask questions in the group at any time or send a private message to the administrator, who will reply and contact the students as soon as possible.
If you have any questions or need help, you can also communicate with other students in the group and help each other solve the problems.
In short, there are many ways to welcome students. The key is to make them feel welcome and respected and provide them with necessary help and support.