I am doing a lab for physics class (gr.12) and I am unsure how to do the uncertainty measurments. I know there are set rules for uncertainty but I forget, could someone help me please?

I am doing a lab for physics class (gr.12) and i am unsure how to do the uncertainty measurments. I know there are set rules for uncertainty but i forget, could someone help me please?We don't do homework, but if you research and come up with the answers and post them here for review, no problem, we'll check it for you. Good Luck.