I am new to quantum computing. I am not able to understand QHT, QWT and QFT. I tried searching for a suitable material but still could not find them. It would be great if someone can explain and also a suggest a book to read these topics.
After some Googling:
To be honest, so far I encountered only QFT which plays very important role in algorithms based on phase and amplitued estimatios (e.g. HHL algorithm for solving linear equations or Shor's algorithm for integers factoring). It is necessary to become familiar with QFT if you want to study quantum algorithms further.
Other transforms usage seem to be in a signal processing. Any addition on these transforms is welcomed.