During your visit to Special Collections for HIST 440, we discussed four tools you can use to locate archival material: ArchiveGrid, Digital Public Library of America (DPLA), LibGuides Community, and Google. If you are just starting out, these tools might help you find some inspiration for a project. If you already have a topic and have already identified your main source material, these tools can help you locate additional historical evidence to lead you in new directions or develop a more nuanced argument.
As with all types of searching: remember that you will need to try and try again with a variety of keywords and phrases, with and without quotation marks, with and without Boolean operators, with broader and narrower search terms, and you will inevitably encounter some dead ends. This is all part of the research process and is perfectly normal. However, if you find you are struggling to use any of these tools effectively, or you want some reassurance that your search methods are sound, you can always ask your friendly librarians and your professors in the History department for guidance.