I don't know how to add intergers. How do I. it is too hard for me

A positive + A positive = A positive (1+2=3)

A negative + A negative = A negative (-1 + (-2) = -3)

Adding a negative is like subtracting a positive (1 + (-2) = - 1) this is equal to (1 - 2 = - 1)

Adding a positive is like subtracting a negative (-1 + 2 = 1)