When I read or hear about Yeats anywhere, I get reminded of his poem 'The Second Coming' and the Irish revolution.
But, if one has to cover Yeats holistically, I suggest a few sources that save your time and energy.
Now, let's start step by step:
WHO IS W.B YEATS?
The crispest introduction has been given by Wikipedia.
There's Britannica too with great content with its 2 min facts.
But, I suggest, you go through Wiki first. Once you get an overview, later if you want, supplement it with Britannica.
A topic on Irish Literature has also been dealt in Britannica.
Now let's come to POETRY FOUNDATION:
Whenever i want to read poems or any of the poems of other writers, Poetry Foundation is my destination.
Read Yeat's work in detail here. The highlight is the 'related' content. You have access to articles, podcasts, blogs to expand your reading.
POETS.ORG is also a good visit.
STUDY NOTES:
After the neat and clean reading on Yeats, that is, the literal reading of facts and his works. It is time to critically anaylse his complex array of works.
SOURCES
1) SPARKNOTES
2) GRADESAVER
3) STUDY.COM
5) LITCHARTS
These sources are more than enough for your reading of Yeats and tackling exams! Narain' s, Ramji Lal and Raghukul Tilak are for non-english grads who just have to swim through the exams as subsidiary papaers. But literature with honors has to have a different approach.
Materials on literature are tough to find and costly. Drowned in umpteen number of books, students are pressed with time to gather quality materials. Quality sources in India can only be found in good libraries, which again cannot be easily accessed.
Go for Norton Critical Editions, Casebooks or Palgrave publications. "Mark and get xeroxed the selected portions," my HOD used to say everytime i was in the library. I remember, I had xeroxed selected pages of York Notes that are still with me.
Now, it's time for sources that are written and compiled by professors from prestigious universities:
1) MEG-01, BLOCK 9 - UNIT 43 AND 44- YOU CAN DOWNLOAD THE ENTIRE BLOCK HERE
2) DU SOL STUDY MATERIAL- PAPER 7- CLICK HERE
3) YEATS- https://youtu.be/jx99mlcglqc
4) NPTELHRD- https://youtu.be/gUfo69s6LKI
NEWSPAPER SOURCES
Newspapaer sources are one of the most unutilised sources when comes to reading. Here are a few articles that may come of use in writing great essays:
1) THE ATLANTIC
2) BBC
3) THE GUARDIAN
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