Reddit mentions of 38 Basic Josekis (Ekementary Go Series)

I'm not a terribly good player, but as someone who is not quite a beginner anymore, I'd just like to say that joseki isn't really important when you're starting out. I'd suggest just looking joseki up after a game and seeing where you might have gone wrong or different ways to play out certain approaches. Joseki are tools, and as with any art or craft the only real way to learn how to use them in the beginning is trial and error, and not blind memorization.

That being said, I use the joseki webpages mentioned here to play through areas I wasn't sure about, or think I may have made a stupid mistake in, and that seems to have taken me to in range of SDK.

There are also, of course, books on Joseki such as 38 Basic Joseki which will endeavor to teach you more about the ideas behind the Joseki. I personally haven't gotten that far yet, and find Life and Death problems, Tesuji, and just shape in general to be a better use of my time.

Hope this helps, and good luck with your studies! As always, just learning what is most interesting to you is rarely a bad thing, so if you want to learn the variations of the Large Avalanche, then I wish you good travels. :)

There are lots of apps and online resources, as others have mentioned. Sensei's Library is always a good first stop for any go questions.

There are several good books on joseki, which go more in depth into the reasoning behind each joseki than most online resources do. I personally like 38 Basic Joseki. It's a good starter book for joseki.

Its a simple beginner book, but you're 20k so...

https://www.amazon.com/Basic-Joseki-Elementary-Beginner-Books/dp/4906574114

If you're limiting yourself to free online resources, I cant think of many besides edigo and josekipedia.

Honestly I don't think joseki should be high on your priority list until you progress to low ddk. Some just follow it without understanding it, and then mess up when the opponent doesn't play joseki.