Some informative websites (in random order):

http://appliedtopology.org

https://research.math.osu.edu/networks/index.html

http://focm-society.org/2020/index.html

https://www.ima.umn.edu/special-workshops

https://hessbellwald-lab.epfl.ch/

https://www.maths.ox.ac.uk/groups/topological-data-analysis

For young researchers:

How do I refree a paper?

Phillip Guo (UCSD) webpage 

Ravi Vakil (Stanford) webpage

For job seekers:

Applying for Jobs (Math dept. in Duke Univ.)

Finding your first postdoctoral employment (Math dept. in U of Virginia)

How to write a research statement? (Steve Hurder’s webpage)

How to write a teaching statement? (An article of James Oxley, Notices)

Tips for the Job Search: Applying for Academic and Postdoctoral Positions Heather (An article of A. Lewis and John S. Caughman, Notices)

How to find a postdoc position? (Notes of Lauren Williams)

https://www.mathjobs.org/jobs

https://eims.ams.org/jobs/