First off, your best source of solid information is going to be a large dose of good old fashioned book reading. Youtube documentaries and blog posts are fun but badly inadequate as a detailed learning tools.
Pick the main periods of history or general historical fields (economic history, political history, etc) you'd like to know about and do a bit of research to find out which 4 or 5 books get the most frequent mention as expert sources of info for those periods or fields of learning.
Start reading those books and look through their references for more sources that might be interesting.
Repeat for each historical period you'd like to know about. It's a slow process but its very thorough.
Also, do read plenty of economic history and theory books, (especially those from the Austrian school and classical liberal school of econ) they will provide you with good context for why a lot of things in history happen the way they do.