The Eisner book is great! Seconding that.
If you haven't hit Scott McCloud's Understanding Comics as well, I would recommend that. It's a bit more heady and a bit less practical, but he does some really good deep dives into certain concepts like panel transitions and how line quality impacts the reader.
I've been really enjoying Drawing Words and Writing Pictures, by Jessica Able and Matt Madden. It's highly practical and builds nicely off of McCloud's work (they reference him a fair amount). Plus, it's set up like a textbook (though a very approachable one) and has really great exercises in it. Doing the homework set out in it really helped me improve the clarity of what I was communicating in my comics.
Depending on what you write, it also might be worth looking at some good books on writing and story structure aimed at novelists, like Save the Cat Writes a Novel or Story Genius. There's a lot of cross-over when it comes to big picture storytelling techniques, even if the mediums are different. Personally, I think Save the Cat Writes a Novel is better than the original Save the Cat (I have both. The original was aimed more at screen writing but more importantly, just isn't as well written). Similarly, the podcast Writing Excuses is phenomenal at teaching all things related to story, and they do occasionally focus on comics specifically, since one of the main hosts is Howard Tayler of Schlock Mercenary fame.
As far as YouTubers go, I really love both Mark Crilley and Walter Ostlie for topics like story telling with comics. Crilley has several FABULOUS playlist on creating comics and stories. He's a really natural teacher. Ostlie has created featured comics for Webtoon and he's especially great for advice on some medium specific topics like vertical story telling. He's started doing a series critiquing individual comics, submitted by viewers, and it's SUPER helpful! I also love Strip Panel Naked, which is a channel run by a guy that has been nominated for Eisner awards for his comics criticism.
Anyway, that was more than I'm sure anyone needed. Sorry, I couldn't help myself! 
