How do i send a message from my MacBook Air to a Non-iPhone user? How do I send a message from my MacBook Air to a Non-iPhone user?
I want to text my friends from my laptop (Apple) and I can't. What should I do?
You could use a third party messenger(which would be preferable to SMS):

Telegram (open source)
Signal (open source)
Discord
Hangouts by Google
WhatsApp by Facebook
Messenger by Facebook

Update: I don't recommend using WhatsApp or Messenger due to security/privacy concerns