These are some links that I've found useful, as an avid internet collector.
List of conferences in arithmetic geometry conferences by Kiran Kedlaya.
Matthew Emerton's webpage, specially the links for students.
The many notes of Arizona Winter School.
Alex Youci's notes and blog.
Brian Conrad's many resources.
Anton Hilado's blog for short introductions to topics in arithmetic geometry
London School of Geometry and Number Theory, including my colleague's websites.
Getz and Hahn's book on automorphic representations (somehow I found it difficult to find this on google).