First one, and this one is very important: be violent towards Nazis. If someone in your near vicinity talks nazi trash, punch them in their fucking faces. We will not tolerate their bullshit in our streets.
Secondly, keep yourself informed, to help keeping other people informed. Not about what the Trump governments latest distractions are, but about stuff like special elections, where Democrats have a chance of taking Republican seats. They just flipped a historically unopposed conservative Senate seat to be democrat.
And third, campaign for progressives who are trying to unseat "moderate" democrats who vote with republicans in America. I might never even set foot in America myself, but the consequences worldwide if trump successfully turns America fascist are insane.