Based on the teachings in GM Wojciech Moranda's Chessable course, Calculate Like a Beast, as discussed in the following episode of the Perpetual Chess Podcast.
https://youtu.be/e_WPzbWE1cQ
The LiChess study of exercises discussed (and additional exercises) is here, courtesy of GM Moranda:
https://lichess.org/study/Eh44UE35/94K6jAQd
Check out Wojciech's course here:
https://www.chessable.com/calculate-like-a-beast-the-moranda-method/course/279827/