These are all resources I wish I knew about (or existed) when I was trying to learn 4D on my own. The internet is very hard to search for 4D stuff, even when you know what it's called and are looking for a specific thing. I hope this can help beginners learn 4D. This contains all the best websites, games, and applications I know of for gaining intuition and knowledge with 4D space.
By the way, research is great, but the best way to learn about 4D is to practice imagining random scenarios, and to ask educated people for help/explanations on things. I have linked to my server, as lots of people there like explaining 4D to new people, especially if you're nice about it. I am very active there.
Every title here is a link, and these are in no particular order, or even sorted.
QFBox has an excellent renderer, and great explanations of every 4D Archimedean solid, and 4D space itself. I have my own collection of 4D Archimedean solids, but the QFBox ones are far more involved. This is a great resource for starting out and wanting to learn about polychora.
This is my own webpage, it aims to teach some intuition about how to imagine 4D more visually and intuitively in your mind. It assumed you already know how 4D works logically.
4D Golf and its devlog series are great ways to learn about 4D. The 4D Golf devlogs are what made 4D into an actual special interest for me. 4D Golf is good to play too, but it's a bit over priced.
4D Miner is fun to play around with and build 4D stuff in. I also recommend the devlog series.
This is another thing by me, this is a polytope viewer. This is great when used in tandem with the polytope wiki, or some sort of folder containing many polychora. You also have to know how to use the renderer, for example, you should set the z-fading and w-fading to different values for different shapes, and remember to subdivide.
This is my "game", Lobby4D. I've already done a webpage that goes in depth on it, but, I've been told by 3 separate people that Lobby4D has made them significantly better with 4D, which is super awesome! I'm so happy I was able to provide people with that experience. Anyway, this application is a 4D museum park thing. Best enjoyed in multiplayer.
This video series is pretty decent. I like the visuals and unique explanations.
I haven't read everything on this site, but what I've seen so far is incredible. I think this is literally the best 4D renderer I've ever seen. They have some cool stuff like 4D minecraft, but unfortunately the controls are so bad it might as well not exist. They also have some 4D physics stuff, which is equally impressive. They've got some cool links and shit. They also have some really cool explanations about things like 4D electromagnetism, drones, and airplanes.
This is my YouTube channel, it has quite a few videos about 4D. Few are explanatory, but I'm working on a 4D platonic solids video, and many of my future videos will be explanations of 4D. This video contains some good information on polytopes, though it is focused on 3D.
Tibees makes decent content. She's got a great relaxing vibe to her videos and I don't think she's ever said something wrong, it's just that her content often disappoints me. For example in this video, she uses a cube and a 3-sphere, which are probably the worst shapes to have used to make this point, as they look identical from those two angles. She should've used a triangular prism and tetrahedral prism or something. I wouldn't be putting this on here if I didn't think her content wasn't worth checking out, though.