A Summer of Key Signatures: Flats

Let's use the summer of 2023 to learn key signatures.
 
 In my Academy this summer my students are learning scales and key signatures and answering the questions

How do I know how many flats?
 How do I know how many sharps?
 Why are the sharps in this order?
 Why do the flats follow this pattern?
 Why is a fifth so important?
 ... etc

The reels I post onto social media will show how to draw the key signatures and we will answer some questions as we go.