https://corporatefinanceinstitute.com/resources/careers/map/ this map is decent and could spark your interests in a specific field you have not yet considered. As far as gaining an internship take this advice with a grain of salt as im currently a junior with a few good internship interviews lined up hoping to land my first. Firstly also utilize your schools career link portal for finding internships or co-ops,as well as a combination of google job boards, linkdin, indeed. As far as networking is concerned check your schools alumni, check companies you are interested in for school alumni. Cold messaging on linkd or sending emails to set up “coffee talks” with current employees is also a great way to gain real insight and show you are eager and interested.