Here are few good resources to refer & learn about UVM:

1. Verification Academy

   1. www.verificationacademy.com

2. Accellera System Initiative

   1. www.accellera.org

3. UVM Cookbook

   1. https://verificationacademy.com/cookbook/uvm

4. Coverage Cookbook

   1. https://verificationacademy.com/cookbook/coverage

5. UVM Coding Guidelines

   1. https://verificationacademy.com/cookbook/uvm/guidelines

6. SystemVerilog Coding Guidelines

   1. https://verificationacademy.com/cookbook/sv/guidelines

7. Doulos

   1. http://www.doulos.com/knowhow/sysverilog/uvm/

8. Various Papers From Cliff Cummings

   1. http://www.sunburst-design.com/papers/

9. Various Papers From Sutherland

   1. http://www.sutherland-hdl.com/papers.html

10. testbench.in

    1. www.testbench.in

11. asic-world.com

    1. www.asic-world.com

12. AMBA (AXI, AHB) Protocols

    1. http://www.arm.com/products/system-ip/amba-specifications.php

13. Synopsys SNUG Papers

    1. http://www.synopsys.com/community/snug/pages/proceedings.aspx

14. Cadence CDNLive Papers

    1. http://www.cadence.com/cdnlive/ww/pages/default.aspx

15. Mentor’s Verification Horizons

    1. http://blogs.mentor.com/verificationhorizons/
    2. http://www.mentor.com/products/fv/verificationhorizons/

You may like to use following online Simulator & data storage cum configuration management site:

1. www.edaplayground.com
2. www.github.com

I will look forward to add more resources in future which might be beneficial for you!

Good Day!