Good free ones (in my opinion) are Zotero and Jabref.
Non-free ones are Endnote, Papers, RefWorks.
Check the features of different reference managers, figure out what works best for your workflow and setting.
Don’t forget to include considerations of collaborative work into your decision.
Pick one. Best to use only one system at a time. Sometimes collaborations require flexibility.
firstauthorXXjournal - title.pdf
Being able to (re)search the literature, organize information (references) and write a clear report (paper) are incredibly valuable skills beyond academia! Practice them and be aware that you are acquiring those valuable skills.
Being a good writer/presenter might be even more important for general career advancement (especially outside academia) than being a good researcher.