Absolutely nothing. I'm a horrible magician. The only relatively applicable bookmarks I have are for liveaquaria diver den's request forms, and premium aquatics (they sell LRS online). Here's what I've got in my brain though:
Reef2Reef (I started moving most of my online forum time to there from ReefCentral, and a couple of tizzies aside, it's been a delight)
PlantedTank (is still alive, and while not exactly kicking, there're still a couple of devoted people on the forum to help out the newbies that join us)
PlanetCatfish (I should really log back on...)
Scapeclub (still unsure if I'm moving to LA or not...)
https://www.reef2rainforest.com/201...ptive-bred-marine-fish-species-list-for-2019/ (this is the 2019 list of all captive bred saltwater fish. I can't find the 2020 version....)
humble.fish (for saltwater disease, an amazing resource for how to treat a lot of common parasites/diseases; I wish Humble would do a freshwater writeup....)
fusedjaw.com (is defunct, but you can still use the waybackmachine to access parts of the site. Tami wrote a bunch of really good articles on seahorses, ranging from tankmates to frozen mysis)
aqualandpetsplus.com (also defunct/they did a complete site revamp, but using the waybackmachine to sometime like 2015 or so gets you to the site. They have a couple of monster fish profiles which may or may not be accurate)
ventralfins.com (yet another defunct website. It's somewhere in the waybackmachine. The dude had a really good kreisel tutorial, as well as some bomb brine shrimp instructions.)
livefoodcultures.com (may or may not sell live food cultures at this point? Still has some pretty good info on a lot of live foods!)
drumandcroaker.org/pastissues.html (more of a science journal than a magazine, but worth the read)
http://www.aquaticcommunity.com/fishfood/wormculture.php (combining culture of red worms with grindal worms; one culture fits all! I always forget about this nifty little article, but it was mind blowing when I first read it around 6 or so years ago)
Coral Magazine ( During around April 2020 or so, they released a username/password so that people could get through the pandemic by reading all the back issues available. I forgot what it was, but I'm fairly certain it's somewhere on the web; whether it's still valid or not is up for debate...)
WetWebMedia (Bob recently passed away (RIP), but he gave me some good advice when I reached out to him. Some of the articles are outdated, but it's fairly easy to parse through which ones are and which ones aren't)
reefs.com (look up the "breeder's net", it does a great job of detailing how to culture a lot of things you'd need for saltwater aquaculture)
YouTube: Oh dear. If I get into any debates about monster fish keepers on youtube. it'll probably end up with me getting banned. But if information is what you seek, BulkReefSupply (saltwater) and Aquarium Co-Op (freshwater) are fairly good at covering a lot of stuff. I might start a YT channel just to get my accummulated knowledge out there? IDK.
Scholar.Google.com . If you're a college student, it's a wonderful resource, since your university probably has access to at least some journals. I've gotten a lot of good information by just being curious and typing in stuff like "Tigriopus culture" to see what pops up.
Books! If you can, get your hands on books! The Plankton Culture Manual, How to Raise and Train your Peppermint Shrimp, and The Complete Illustrated Breeder's Guide to Marine Aquarium Fishes are all amazing.