Flaired experts exist in every category of historical inquiry, from Tudor-Stuart Politics & Society, to Heian - Edo Japanese Arms & Armor, and beyond. These academics will answer questions in painstaking detail and cite sources in support of their statements, in case you were in doubt.
But if you're more interested in plumbing the depths of human history by reading on your own, /r/AskHistorians still has you covered. Their booklist provides a catalogue of starting points for any historical journey, from a dive into Icelandic Sagas to an exploration of Zimbabwean independence. There's more history to look back on now than ever before, so why not enlist professional aid to guide your search?