Harsheet Gandhi successfully completed an online course through Coursera titled "Regression Models" offered by Johns Hopkins University. The course taught students how to fit and interpret regression models, investigate residuals and variability, and use techniques like dummy variables, multivariable adjustment, and extensions to generalized linear models including Poisson and logistic regression. The certificate confirms completion of the online course but does not reflect the entire on-campus curriculum or confer a grade, credit, or degree from Johns Hopkins University.