Here is a tip on the WW1 History. You are going to get at least two perspectives on the Western Front; one that the British and French generals were all idiots, and the second that they were all geniuses. Lean more to that idea that they were all idiots, or as is often stated Donkeys leading heroes. Get a generalist history for the period first to just give you a tiny sense of the scope of the war.
It is an immense tableau ...... keep that in mind from Murmansk to South Africa. From the naval battles off Argentina to the final vestiges of the Czech White Army going to Vladivostok. I have studied it for 40 years and still don't know it all, I have dozens of books about it, and have borrowed many more. You can't understand it all without studying things like the Russian Revolution in depth.
Then there is the naval battles and of course Jutland ....
You need to learn about the tangled weave of Queen Victoria's family, and how Wilhelm's jealousy of Prince/King Albert plays their parts.
Then there is the story of America, and don't forget to read the John J. Pershing biography. Don't forget to study that liar WIlson, and that idiot from our home state; William Jennings Bryan. There is so much to unpack, you have to do it in pieces. Don't neglect to read Churchill's biography .... and the story of Gallipoli ..... how the Armenian genocide occurred .....