I've not played 40K since the 90s. I have vague memories of some major events like there being a Horus Heresy and some knowledge of Space Marine chapters (Blood Angels are mad, Ultramarines are dull, etc) and Chaos Gods (Nurgle is disease, Korn is angry, Tzeentch is knowledge and scorcery).
I want to start reading on a good Space Marine book but there's hundreds!! I thought about just picking the best rated on Good Reads but you seem to require a lot of background for some of them so I'm hesitant. E.g. Ragnar Blackmane has been recommended but I don't know enough about Space Wolves for the blurb on the back to make sense. Cadia? Flesh Tearers? Dark Angels - I only know they had cool dark-green armour in the 90s.
So any advice on where to begin that would be a an easy intro would be much appreciated!
Likes:
Space Wolves! Who doesn't like viking-space-wolfs? I'd love to learn more.
Magnus the Red (also a good guy and tragic - I only know this as I spent hours reading wikis!). Shitty armour though!
Chaos (esp. Tzeentch who I'm convinced is a true god and the only "Good Guy" in 40K)
For chaos
The Ahriman omnibus follows Ahriman from thr thousand sons legion after the heresy and is a fun story. It's got lots of thousand sons warp fuckery and some great characters.
The night lords omnibus is one of the first 40k books I read going into 40k with not a whole lot of knowledge. It's still probably my favorite 40k book, the characters are written incredibly well, the dark moments of horrific comedy are there, it features some great fights.
Fabius bile omnibus follows fabius bile of the emperors children legion in what's essential a great mad scientist story. Once again great characters and a fun story definitely worth the read.
The lion son of the forest is a very new 40k that follows the lions return to the setting. From what I remember it doesn't require a whole lot of backstory to be neccesary, as it explains a lot along the way. It's very involved with some dark angels space marine characters so I could be a decent jumping off point of sorts.
40K lore is huge. The best advice that I can give you is to pick a faction you like the most and just start reading about their part of the setting first. It sounds like you're into Space Wolves, so I'd pick up Ragnar's novels and just keep going from there.
Eventually, the main themes of 40k's lore will start to come up repeatedly, and the wider universe will start to make sense through osmosis the more you read. I'd recommend avoiding wikis and youtube lore however, a lot of that stuff is poorly written and badly researched, and it's a lot more satisfying in my experience reading the books the wikis are based on.
I'd also recommend Eisenhorn as a great starting point. But Games Workshop also sells rule books called codexes which have tonnes of great up-to-date lore about each faction.
@cashews_best_nut
So other than the Horus Heresy books which kinda-sort-of build on each other, you really can start with any 40k book that doesn't have a "Number # of a series" on it. The intention with most is that "any book is someone's first book" so while you'll pick up more if you've read other books there's little "required" reading.
"A Thousand Sons" might be your best bet. Focus is on Magnus and his legion but Space Wolves are a big part as well. Only issue is that it is technically the 12th book in the Horus Heresy series, though I personally started with book 14 and didn't have too much issue.