no, i dont understand stuff like 1.k4 2. j3 3. Bj2
picture please
4PC FFA Openings

old FFA opening guide by skak4 (now @4kaks) : https://www.chess.com/clubs/forum/view/guide-list-of-named-opening-theories-and-game-principles-by-skak4
For FFA intermediate/advanced (FFA > 2200)
Mostly team openings are played, so get a basic understanding of them as described below. I also recommend to play teammode first to learn about basics mate tricks.
Team
1. h3 and Qj4 are mostly played ur teammate get in most situations his q also out, the best way to kearn this kind off openings is just to get experience.
I still don't understand why this is accepted as normal, or why a 2300 game is fundamentally a completely different game than a 2100 game. It violates the principles of development and structure in favor of fast tactics which the opposite player must implicitly and in some cases explicitly agree to.
Maybe I just feel this frustration as a Karpovian-style FFA player (slow, positional, gaining long-term advantages) which will always lose to two Tal-style players violating opening principles to combine forces for fast tactics that are fundamentally unsound
Why can't people who want to team just stick with teams? There's a reason the variants are separated
Please post only Openings here, and discuss other things in other topics
That's fine I get that, and your pictures are merely basic ideas that ignore the counter-threats caused by the other moves.
Like for early push, the blue player can counter-push and threaten a bishop check, which forces red to play prophylactic moves against that threat.
Or for fast castle, you will most likely EVENTUALLY play all 4 moves but they do not need to be the 4 very first moves, and they will not always be in the same order depending on what happens with the diagonals and the nearby knight.
Your opening idea after move 1 could be completely different by move 2 depending on what the other three players do.

A good way to fight aggressive knights is moving your pawn in front of your room for one step.
You can also Nf3 or Nh3.
Here are couple of openings for Free-For-All 4-Player-Chess, because I haven't found much in pinned guides and topics.
First 4 or 5 moves are the most important.
1. Queen Rush
Queen in 5 moves, very strong and popular opening.
2. Fast Castle
Popular defensive opening
3. Mating Queen Push
4. Infiltration
5. Roaming Queen
Start roaming the board with queen as soon as possible
6. Aggressive Knights
Do you know some other openings for free-for-all 4-player-chess? First four or five moves.
Do you have your own or favorite ones? And pictures?