How to improve your level in analytics?

Question

Python

Good afternoon.
Got a job as an analyst. So far, I have little experience, I'm a novice specialist. Himself a mathematician. I want to develop in the field of analytics.
1) Please advise any forums for analysts, books on analytics, machine learning, courses, anything that will help you improve your level.
2) Is it easy to change the field of activity. For example, from IT to go to another area and vice versa?
Moderator, no ban, please question, thank you.

Answer 1

https://bigdatauniversity.com/learn/data-science-b...