How does a developer choose which media breakpoints to use: Similar to the idea of multiculturalism the target audience is used to decide the most popular screen sizes.
Updating Websites: As the most popular screen sizes have changed over the years it is very important to keep updating your websites to keep this in mind especially with older sites.
Most popular media breakpoints: the most popular media breakpoints on mobile are 320px-480px while tablets are 601px-768px and laptops/small desktops are 1025px-1280px and large desktops are 1281px-1440px