Least Squares Courses
Johns Hopkins University via Coursera Advanced Linear Models for Data Science 2: Statistical Linear Models
Johns Hopkins University via Coursera Undergraduate Econometrics
YouTube Linear and Logistic Regression (German)
Amazon Web Services via AWS Skill Builder Orthogonality
YouTube Fourier Series
statisticsmatt via YouTube Gradient Descent, Step-by-Step
StatQuest with Josh Starmer via YouTube Linear Regression, Clearly Explained
StatQuest with Josh Starmer via YouTube Statistical Learning Theory and Applications - Class 7
MITCBMM via YouTube Optimization Theory and Algorithms
Indian Institute of Technology Madras via Swayam