Think of dynamic shelving as good marketing of your collection. What student - or anyone, for that matter - wants to see row after row of book spines and none of those beautiful covers? With a little bit of creativity, experimentation (and consistent weeding), you can make your collection a lot more discoverable and your students' lives easier.
Read the basics in this Book Riot article and then explore expert (and originator of dynamic shelving) Kelsey Bogan's excellent webinars Rethinking Collection Organization and Dynamic Shelving. Be sure to catch her Dynamic Shelving Q & A as well.
Depending on your school's cataloging preferences, your library may be organized according to either the Dewey Decimal system (DDS) or the Library of Congress system, though most K-12 schools use Dewey. There's also been a recent trend in "genrefying" collections, which means organizing the books based on genre and/or topic much as bookstores do - e.g. fantasy or coming-of-age in fiction - as opposed to a numbered classification system like DDS. Though most often used for fiction, genrefying can also allow school librarians to curate nonfiction to be more findable and relevant to students while also offsetting the outdatedness and non-inclusiveness of the 19th-century Dewey classification system.
Resources for Genrefying
Genrefication Best Practices from Follett
How Genrefication Makes School Libraries More Like Bookstores by Gail Cornwall
How to Genrefy Your Library by Megan Mabee at BookRiot