You might consider searching How to save time researching my questions before you get so frustrated, just sayin. https://fs.blog/how-to-read-a-book/ If you want to save time, forget youtube as a first step in research until you read a few sources. Youtube is by and large - linear. Text, especially published books contain Tables of Contents and Indexes at the back. Using thise tools, information specific to your question will either be listed or not, at which point you dive in or reject that particular source and move on to the next one. Bernstein had a book decades ago with what you mention above. Search Jake Bernstein and seasonality.