Formerly pretty good free resource for academic citations now turned into a giant pile of steamy hot garbage by the incredible asswipes at Chegg, a corporate name that mostly calls forth the image of a debilitating sexually transmitted infection.
You probably weren't graded for correct citation either. Nowadays you can get into real trouble for citing inconsistently or incorrectly. Especially with the automated plagiarism software that automatically runs over your texts once you turn them in.
It’s not a necessary tool for all fields. I don’t know your area but mathematics journals have vastly different style guides and citation standards. The best way to handle this is to export a bibtex citation which is just a list of metadata tags, then plug in the journal’s style header before compiling your TeX.
When you have 100s of citations in multiple chapters, it's nice to have. Especially if you can generate them from a PDF of the paper you're trying to cite.