Best ways to leave clues throughout and how to create a great plot twist?

Hello! I’m currently in the research stage of my book series. I’m doing this in my spare time as a hobby really and it’s my first real go at it! I have the general gist of how I’d like the story to go, but I’m wanting to include clues throughout, that perhaps have double meaning so when the plot is revealed the readers/audience gasp and think back to how it could have been linked to previous portion of the book!

I’d also love any advice on how to make plot twists extra twisty or juicy and shocking!

Thank you so much in advance xoxox