Hi,
You use "gör" in present tense - ex "Jag gör allt just nu" - "I'm doing everything right now"
And "göra" is the infinitive tense - "att göra" ex: "att göra ingenting" - "to do nothing" but it is also used in future tense, ex: "jag ska göra allt" - "I will do everything"
Hope this helps:)