People intersted in Algebraic and Number Theory may consult the following links:

• Interesting course notes on different topics of  Number Theory :  J.S. Milne.

• Ellegent and summerized notes on Class Field Theory :  Kiran S. Kedlaya.

• Youtube channel featuring interesting online courses on various topics in Algebra and Number Theory : Richard E Borcherds.

• Results  and problems related to the p-Class Field Tower and Cubic Fields :  Daniel C. Mayer.

• Very useful courses on Commutative Algebra and Algebraic Geomery : Stacks project.

• Some very nice expository articles on some directions of Number Theory and Algebraic Geomery : Dipendra Prasad.