I hate perl6. I hate it because I tried to get involved in the project early on, and it led me down the Haskell rathole. I don't know what Haskell looks like today, but a decade or more ago it was the hardest language to pick up that I had ever experienced. It was as if I had a solid background in latin languages and I was trying to pick up Chinese based on a handful of tutorials written by a tourist on the back of a napkin.
But it has been a decade and I am truly impressed with what it has turned into. Unfortunately, it has to re-gain mindshare as if it was starting from scratch. It might be a little bit harder actually, because there are a variety of scripting languages these days that are easy to learn, and there are still more than a few people who actively don't like Perl.
I really liked this slideshow: http://tpm2016.zoffix.com/#/
It gives a good review of Perl6 from early 2016. The video is an hour and a half, but it only takes a few minutes to scan through the slides and find the interesting pieces. (left and right arrow to navigate the slides)
The Haskell introductory landscape has definitely changed.
Learn You A Haskell for great good (http://learnyouahaskell.com) is an excellent introductory book to read to get started with Haskell.
A drier but more in-depth read is http://book.realworldhaskell.org/
Also, when you hit monads again, the best advice I can give you to understanding them (99% of Haskell guides out there seem to be about monads) is to take this path:
Functors -> Applicatives -> Monads
And check out this link: http://adit.io/posts/2013-04-17-functors,_applicatives,_and_...
I'm not sure those resources were around when last you tried haskell, but they're worth giving a read.
Haskell has M:N threading, and a strictness about types and semantics that's very refreshing to me. Yes, I could have written my most recent web project in some other language that would have been quicker (because it would have been simpler and likely more imperative), but I trust my codebase so much more with Haskell. Ironically it's my own understanding and clarity of thinking that I sometimes doubt now, but that's a good problem as far as I'm concerned, makes me think clearer.
[EDIT] - Can't believe I forgot, but Erik Meijer's series on Haskell is actually one of the first resources that actually got me really into it, it is absolutely fantastic, I actually watched the whole series before I read learn you a Haskell.
https://channel9.msdn.com/Series/C9-Lectures-Erik-Meijer-Fun...
tl;dr: 1) If you want to buy a book, http://haskellbook.com/ is supposed to be good
2) If you instead want to learn from free online sources, a) cis194 spring 2013 followed by b) The data61 course (links in the github link above).