Hi yanizal77,
Thank you for reaching out Microsoft Community.
For you to connect the Surface Go to a projector, you should be using a USB-C to HDMI adapter. The Surface Go doesn't have a HDMI port so you can't connect it directly. However, an adapter is much needed if you need to extend your Surface Go's display via projector for visual presentation purposes.
If this answers your question, please let our Community know by marking this post as an answer. Otherwise, don't hesitate to respond to this thread for further assistance.
Kind Regards,
Crest_Z