Hi, FernandoHeredia1!
Thanks for reaching out to Microsoft Community and posting your inquiry regarding the Surface Go. I am happy to inform you that you can multi-task on your Surface Go, so you can open multiple PDF files. The device can handle light to moderate usage on it.
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 if there’s anything else that needs to be addressed.
Kind regards,
Janette_Z