I need to add a course after drop/add has already ended. How?
If the instructor agrees, you’ll need to fill out a late add form. The instructor of record will need to email the form to the department head, who will email it to the registrar (UGA emails used in lieu of signatures). https://reg.uga.edu/student-forms/late-add-form/
Do this before the withdrawal deadline! Late add forms cannot be processed after that point.
What’s the difference between dropping and withdrawing from a course? Does it affect my financial aid?
Dropping a course during drop/add does not count against your attempted hours (which counts with HOPE/Zell) or appear on your transcript. Your financial aid will get reevaluated if you drop to fewer hours, so always check with financial aid when you have questions/concerns. https://osfa.uga.edu/policies/enrollment-and-financial-aid/dropping-courses-vs-withdrawing/
For general advice about withdrawals: https://osas.franklin.uga.edu/withdrawal-faq