By fascists themselves: (CW: Omega Brain Rot)
-Fourth Political Theory- Aleksandr Dugin • I know liberals exaggerate how much influence he’s had on Putin, but he has legitimately had an influence on the Western far-right.
-Stalin: The Enduring Legacy- Kerry R. Bolton • If you ever wonder why some fascists like Joseph Stalin (besides brainworms), he basically lays it out here. (Note: this isn’t to indict Stalin or anything, but occasionally you run into some wild-ass opinions (wild even for fascists), and this is one of them)
-Integralism: A Manual of Political Philosophy- Thomas Crean • Catholic integralist (Catholic fascist basically) explains what a Catholic (and reactionary) vision of political order would look like.
-American Conservatism: Reclaiming an Intellectual Tradition- Andrew J. Bacevich • This guy is not a fascist proper, but he is an anti-war conservative (his books are published by Haymarket Books and he works at the Quincey Institute if I am not mistaken) and in this book, he compiled a collection of writings by mainstream American conservatives. I still think it is important to know what mainstream conservatives think, at least to rebut the talking points that they will throw at you. (Beware: 833 pages long)
By others (non-fascists):
- Joseph de Maistre’s Life, Thought, and Influence: Selected Studies o Counter-Enlightenment catholic thinker. This can help you possibly understand how Catholic reactionaries out there think. The reactionaries’ project, in part, is to turn back the Enlightenment and this guy was one the O.G.s in wanting to do this.
-The Anatomy of Fascism- Robert O. Paxton • Has a definition and analysis of fascism that many leftists like due to the focus on praxiological aspects of fascism
-The Rhetoric of Reaction- Albert O. Hirschmann • Basically, what the title says. It’s an analysis of the common themes present in the rhetoric of reactionaries. (you’ll see it everywhere after you read this)
-The Reactionary Mind: Conservatism from Edmund Burke to Sarah Palin- Corey Robin • Robin analyzes what reactionaries of various stripes seem to have in common. A bit of a survey work with some analysis.
-The New Faces of Fascism: Populism and the Far Right- Enzo Traverso • Lays out what “post-fascism” looks like these days (I doubt people on hexbear would bother with the label of “post-fascism” given that you should treat them the same way as you would treat fascists. Nonetheless, some people do use this label and this is a good analysis of this current.)
-Dangerous Minds: Nietzsche, Heidegger, and the Return of the Far Right- Ronald Beiner • A tracing of the ideological roots of right wingers like Richard Spencer, Aleksandr Dugin, and Steve Bannon.
-The Political Right and Equality: Turning Back the Tide of Egalitarian Modernity- Matthew McManus • Provides a genealogy of the intellectual roots of the political right beyond Nietzsche and Heidegger. Also works as kind of a survey of all the most politically brainwormed philosophers that more progressive forces of history have had to contend with. (on the intellectual plane, at least)
-Dreamer of the Day: Francis Parker Yockey and the Postwar Fascist International- Kevin Coogan • The subject of this book, Francis Parker Yockey, did try to create something like a fascist international and this is his story of how he tried to do it.
-Right-Wing Critics of American Conservatism- George Hawley • A survey of right-wing intellectual movements that differ from mainstream conservatism and each other.
Let men know if you need more 
Forgot to add one more:
White Skin, Black Fuel: On the Danger of Fossil Fascism- Andreas Malm -Will help you understand the chud obsession with fossil fuels.
No worries, homie.