Trump will be the first convicted felon president. Although he won, as of November 14, as votes continue to be counted his total dipped below 50%.
Much of Theda Skocpol's 2017 "A guide to rebuilding the Democratic Party, from the ground up" in Vox, is still apt. Skocpol, a Harvard sociologist and political scientist urges progressives to avoid the traps of endless "election replays," squabbles over "message," failing to coordinate interests and causes, or giving procedural fixes too much importance. Instead she advocates strengthening Democratic party organizations at the national and state level, identifying groups that can replace the role formerly played by unions, organizing locally to oppose Trump, improving political intelligence, and focusing on near-term state contests. As consensus emerges for countering the Republican takeover we will update this section.
University of Sheffield's James Weinberg (UK) has a reading list on authoritarianism.
Above you'll find links to the national American Civil Liberties Union, People for the American Way's Right Wing Watch, the Anti-Defamation League, and other resources. Finally, if you're concerned about public safety consider contacting a mutual aid group in your area.