This lecture explains the Mann Whitney U-test for comparing two population median.
Other videos @DrHarishGarg
How to write H0 and H1: https://youtu.be/U1e8CqkSzLI
Other Non-parametric tests
Sample Rank Correlation-Coefficient: https://youtu.be/USqlzYkAdAM
Mann-Whitney U-test: https://youtu.be/eZP1nFlVejM
Wilcoxon Signed-Rank Test: https://youtu.be/sJvRbLel4oM
Sign Test: https://youtu.be/i2hExvzkuGI