Can't understand chess composition notations

I've just started to try some chess compositions but I can't understand a lot of the notations used.

For example, I know that #3 means mate in 3, s#3 means selfmate in 3, h#3 means helpmate in 3, but what do these two mean? I know ser means something like seriesmate but what's the "h" for?

1) -11#3

2) ser-h=23

Also, chess compositions with fairy pieces are even more confusing, can someone explain about this? And what does numbers like 5 + 7 below a chess composition mean? Do they mean the points you get for solving it?

Where did you find such compositions bro?

" -11#3" – That doesn't look quite right, though the minus sign at the start typically means a retractor problem, e.g. "-1 & #3" means White retracts one move then mates in 3.

"ser-h=23" – That is short for "series-helpstalemate in 23 moves". The equal sign means stalemate. See this article that explains most forms of series-movers.

There are countless types of fairy pieces used in unorthodox chess compositions. The three largest groups are leapers (generalised knights), riders (generalised rooks and bishops), and hoppers (e.g. grasshoppers). See this wiki article: Fairy chess piece.

The numbers like "5 + 7" below a diagram are a checksum to help see if there's an error in the position. "5 + 7" means there should be 5 white pieces and 7 black pieces.

Thanks.

Chess composition notations can be complex, especially with variants like series-mates and fairy chess. For example, -11#3 indicates a series-mate where one side makes 11 consecutive moves, and then the opponent must deliver mate in 3 moves, while ser-h=23 refers to a series helpstalemate, where 23 consecutive moves result in a stalemate. Fairy chess involves non-standard rules and pieces, such as the Grasshopper or Nightrider, adding unique challenges to compositions. Numbers like 5 + 7 below a chess problem usually represent the material count of pieces, not points for solving. Understanding these notations opens up a fascinating world of creative chess puzzles.
 
 witamina k

Speaking of compositions, some here may want to join my club, The Problemists’ club. There we share our chess compositions, and we even have a contest where you can try to be the Composer of the month, by posting your own-composed puzzle. Everyone interested, join!