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Indivisible Guide: "Former congressional staffers reveal best practices for making Congress listen." Includes a downloadable guide and links to local groups taking action.
Call the Halls: Contacting Your Representatives the Smart Way: Another guide based off viral tweets by a former congressional staffer. (Available through a pay-what-you-want system: $0 does work.)
Who Is My Representative: Put in your zip code and find who represents you in Congress. (Might be slightly outdated - mine still had my senator who retired after the Nov 2016 election, so also check the directories on the US Senate and US House of Representatives sites.)
5 Calls: The theory is "spend 5 minutes, make 5 calls". They help you with numbers and scripts and allow you to log what happens.
( Suggestions. )