Here are some quick link of best  Selenium testing blog/forum/Websites.

1. https://www.selenium.dev/documentation/en/
2. http://learn-automation.com/selenium-webdriver-tutorial-for-beginners/
3. https://www.automationtestinginsider.com/
4. http://www.seleniumeasy.com/selenium-tutorials
5. https://www.toolsqa.com/selenium-tutorial/
6. https://www.softwaretestinghelp.com/selenium-tutorial-1/
7. https://www.techlistic.com/p/selenium-tutorials.html
8. https://selenium-by-arun.blogspot.com/
9. https://artoftesting.com/selenium-tutorial
10. https://www.guru99.com/selenium-tutorial.html
11. https://www.javatpoint.com/selenium-tutorial
12. https://www.gcreddy.com/2015/06/selenium-videos.html
13. https://www.softwaretestingmaterial.com/selenium-tutorial/
14. https://javabeginnerstutorial.com/selenium/selenium-tutorial/
15. https://naveenautomationlabs.com/
16. https://www.qtpsudhakar.com/

Here are some quick youtube links of the best  Selenium testing channel/video.

1. Lets Automate - Mukesh Otwani
2. Naveen Automation Lab
3. SDET - QA Automation Techie
4. Automation Step by Step - Raghav Pal
5. Way2Automation - Rahul Arora
6. Software Testing Material
7. learnby bhanu
8. HelpingTesters
9. G C Reddy
10. Software and Testing Training
11. Software Testing Help
12. EvilTester - Software Testing
13. Joe Colantonio
14. Test-O-Blog
15. Testing World
16. Software Testing Step-by-Step
17. Association for Software Testing

Here are some website to practice Selenium 

1. https://www.seleniumeasy.com/test/basic-first-form-demo.html
2. https://phptravels.com/demo/
3. http://thedemosite.co.uk/
4. http://newtours.demoaut.com/
5. http://the-internet.herokuapp.com/
6. http://automationpractice.com/index.php
7. http://book.theautomatedtester.co.uk/
8. https://s1.demo.opensourcecms.com/wordpress/
9. https://ultimateqa.com/dummy-automation-websites/
10. https://www.saucedemo.com/
11. https://ultimateqa.com/automation
12. https://github.com/gothinkster/realworld
13. https://github.com/nadvolod/react-shopping-cart
14. https://parabank.parasoft.com/parabank/admin.htm
15. https://www.telerik.com/support/demos
16. http://the-internet.herokuapp.com/
17. https://www.phptravels.net/
18. http://newtours.demoaut.com/
19. http://automationpractice.com/index.php
20. https://demoqa.com/