Look to your Safety During Protest and read about Staying Safe During Civil Unrest.
How to Protest Safely During a Pandemic is a good source of information, but because of the photo of the "ACAB" poster in the article, I thought I'd note that the acronym in question stands for "All Cops Are Bastards" and is a slogan of long standing in the skinhead subculture. Because non-racist skinheads may use this acronym as well as racist skinheads, it should be carefully judged in the context in which it appears, or one might wish to reconsider its use entirely.
Do you know How to immobilize a tractor trailer that's threatening lives? If you follow the thread, you'll find a tip to deal with tractors without their trailers.
Here are some useful links about tear gas exposure and its neutralization: What to do if you're exposed to tear gas, What Is Tear Gas? | How Tear Gas Works — Riots and Protests 2020.
Staying home? You may wish to contact Congress: Contact Your Representative (the page is currently down, but here's a list of representatives by name or by state) and Contact Your Senator (there's a search tool, under which there is a list of senators with contact information by state).
You can also vote from the safety of home! You can check your state's Absentee Ballot Rules, and read about Absentee Voting Information for U.S. Citizens Abroad if that applies to you.
Because I promised Shog that I would not drive people to the polls on Tuesday, 3 November to vote in our presidential election, I am now working virtually with others to see to it that non-partisan, free rides to and from our local polls will be available on the day. Getting people to vote is the most important thing that I feel I can do right now. Some people need voting out, some, in, and nothing will change in this country if we don't participate in our democracy. Our voices need to be louder than the racists'.