I am a student of history but since I focus on early modern times my knowledge of the First World War (on an academic, source based level) is rather basic. I was trying to dive deeper into the topic since I just felt like learning more about it. During my research (that hasn't gone too far yet), I stumbled upon this YouTube Mega-Series and watched the first few videos and while they do point out their sources, I haven't found the time to check them for their accuracy and "unbiasdness". Is it a good way to get a broad overview of the topic, that can be deepened or are they heavily leaning towards specific viewpoints? I hope this isn't the wrong place to ask such a question, and I will remove it, in case you (mods) view it as inappropriate.
Indy and the team do a great job over at The Great War channel. Their weekly videos on what happened 100 years ago are based on the following regular sources, which you can find in the video descriptions:
*Gilbert, Martin. The First World War. A Complete History, Holt Paperbacks, 2004.
*Hart, Peter. The Great War. A Combat History of the First World War, Oxford University Press, 2013.
*Hart, Peter. The Great War. 1914-1918, Profile Books, 2013.
*Stone, Norman. World War One. A Short History, Penguin, 2008.
*Keegan, John. The First World War, Vintage, 2000.
*Hastings, Max. Catastrophe 1914. Europe Goes To War, Knopf, 2013.
*Hirschfeld, Gerhard. Enzyklopädie Erster Weltkrieg, Schöningh Paderborn, 2004
*Michalka, Wolfgang. Der Erste Weltkrieg. Wirkung, Wahrnehmung, Analyse, Seehamer Verlag GmbH, 2000
*Leonhard, Jörn. Die Büchse der Pandora: Geschichte des Ersten Weltkrieges, C.H. Beck, 2014
I've also seen them make regular use of "A World Undone: The Story of the Great War" by G.J Meyer and "The Great War Generals of the Western Front 1914-1918" by Robin Neillends, though I don't know why they don't include those in the description but they always attribute it verbally. As you can see from that list they draw on both the Allied and German perspective, which is more than a lot of WW1 videos will do.
As you've probably seen in the episodes, they make frequent use of primary sources, particularly video, images and quotes from generals and soldiers. For instance, if he's discussing weapons and armour, the video will display those weapons and armour, which is great and something that can only really be done through videos.
In terms of biases, they try not to have any. They provide a rather balanced view of controversial figures such as Douglas Hague (https://www.youtube.com/watch?v=V0CwqA-UB-0), for example, when a lot of professional academics don't. Sometimes Indy will end an episode with some remarks of his own, or from one of the historians he has worked from, but he does so in a way that encourages discussion and thought rather than presenting his own opinion as fact. For example, in the most recent episode he closed the video by pointing out that Hague had gone from the disaster at Passchendaele to a hugely successful offensive in September 1918 and quoting a claim from "The Great War Generals of the Western Front 1914-1918" by Robin Neillends that as of September 1918, Hague was the most successful commander on the western front, and encouraging his audience to re-evaluate their opinion of Hague in light of that.
As tertiary sources go, Indy and crew are pretty great. The Great War is a fantastic channel to get a detailed, generally impartial overview.