How do I make a mail which alerts a few other mails when I send a mail to that one

I tried to make a mail id such as groupchat2021@gmail.com which when sent a mail to alerts a few other mail IDs

It is available for my university where when they send a mail to be2018a@mecha.siu.edu.in the people who are part of that group are all notified.

I wish to do this because I am now forming an team in my uni and I don't want to create a label and type it every time. Instead anyone who sends a mail to the groupchat2021@gmail.com everyone added to that conversation should be notified

Please help me out

Thanks in advance.

P.S my organization uses gmail

Hey I used google groups and it worked Justsearch for google groups