MSC (clickable, 2020 version)
This is the list of Mathematical Subject Classification numbers from
2020 - it takes a few clicks to continue to narrow down your interests each time. You start with the main numbers first (such as 92 - Math
Biology) and then look at more specifics depending on what fields you
are interested in (such as 92-08). Having a variety of ideas and
interests will help you later on down the road!
Click on MSC (clickable, 2020 version) to open the resource.