Can someone tell me how and why there are 3 brilliants?

https://www.chess.com/analysis/game/live/67324262777?tab=review

This is the game review, and need help getting better at chess! Thanks

There are 3 brilliant moves, because you played moves that were really good. Further intel can be found through the coach annotations, but I will give a brief summary to my opinion

Move #1 - Qd2 is a dominating move that takes full control of your opponents position. While not being entirely deservant of the title of brilliant move, it is quite good

Move #2 - Qxf4. This is one of the ones that I have no idea about. Honestly, why this is a brilliant move idk

Move #3 - Qh1 is probably the best move out of the scenario and again controls your opponents position, gains tempo, and wins material. This also sets the stage for other moves like a6 to destroy your opponents kingside and win the game

I'm not entirely sure on these points, but this is what I think. Let me know if you have other questions

Running it at max depth there's two brilliants 14.Qd2 and 16.Qxf4 so not sure what third move you're referring to, maybe it shows up differently analyzing on a phone.

For Qd2, you defend the rook tactically because the knight would be lost with check. Also opponent is forced to respond with very passive moves to defend like knight e2 or bishop c1.

For Qxf4, it seems like you're hanging the rook but not really because you can trap the bishop with pawn to c6 so you end up getting a knight and bishop for rook and pawn which is a winning trade.

QH1 showed up as one idk but thanks for helping game understand!

If you need help, I'd recommend working on winning in the endgame when its just you and a queen and the enemy king, seriously y'all spent like 35 moves just playing randomly XD

When possible, move the queen into a knights distance away from the enemy king, in an l shape, and then copy every single one of their moves, if they move up you only move one up, if they move sideways you move one space in the direction they did. Repeat this until they get into one f the corners, once they move into the corner copying them will stalemate them so don't do this, it's heartbreaking. Keep your queen still and then move your king closer and closer until it cant move any closer to the king, but dont get into the way of your queen, just move until it's 2 spaces away from the other king. Now move your queen in between both your pieces and you checkmate them in way less time with way less chance of stalemate.

all 3 of the brilliant tags have to do with the "hanging" rook on a8 which is indirectly defended in some way by each brilliant move.

14... Qd2 is a sacrifice of the a8 rook where black threatens to play Qxe1 with check and paralyze white's remaining pieces. 

16... Qxf4 also sacrifices the a8 rook, but this time it is out of necessity and it is also the only winning move in the position. if you save the rook on this move (say by Nc6 or c6) white plays 17. Bf1 and the black queen is trapped in brilliant fashion.

21... Qh1 sacrifices the a8 rook for a third time, but this comes with a threat of Qxe1 again paralyzing white's remaining pieces.

hope this helps!

Or maybe chess gods were gone mad by earlier blunders

My suggestion is that you should go through the game once again, and try to spot all the moves when either white or black blundered a piece.

To get better at chess, you should not blunder pieces. Even one of those can cost you the game even against mediocre players. And this game had at least two dozen blunders. If you want to get better, this is the only thing that matters.

Thanks everyone for helping

I thought briliant move were only possible with sacrifices

You thought right.

You can learn also from the ?? sign for some moves, it'll help you to be better.
As to win, it's not required to have more brilliants moves, but instead it's required to have less blunder moves.