Which online resources are most strategic for study? After looking around online at least the following seem to be a good starting point but are there any other resources that would be useful for beginners and those who want to improve their rank?
101Weiqi: https://www.101weiqi.com/
Nick Sibicky Go Lectures: https://www.youtube.com/@NickSibicky/
Baduk TV: https://www.youtube.com/@baduk_tv
Sensei’s Library: https://senseis.xmp.net/
You may also add https://en.1200igo.com/
Compare to 101Weiqi, I think I have tried my best to categorize the puzzles, and also include more puzzles and contents about the opening and the end game.
I highly recommend mark5000’s three tutorials on the first page of OGS’s Puzzles tab.
Also, I personally found Dwyrin’s long-running “Basics” series of commented games more helpful than Nick Sibicky’s lessons, Here is the first one: Dwyrin's Back to Basics - 01 - Fundamental Play - YouTube
Usefulness is somewhere linked to your level, how strong are you?
I started watching it. You are right it is really enlightening.